{"id":"GHSA-r28c-9q8g-f849","revision":null,"records":[{"revision":"a305231deae0411b9d5c9a3ea8a082ec","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-73646","aliases":[],"title":"PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure","description":"PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.","state":0,"publishedAt":"2026-08-17T15:35:13.518+00:00","modifiedAt":"2026-08-17T16:36:37.422+00:00","affected":[{"ecosystem":"Vendor product","name":"postcss","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"postcss\",\n                    \"product\": \"postcss\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 8.5.18\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849","https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c","https://github.com/postcss/postcss/releases/tag/8.5.18"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73646","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73646","identifiers":["CVE-2026-73646"]},"retained":false,"historicalAffected":[]},{"revision":"8e95c9ab0b704a28a16700dedc767d03","observedAt":"2026-11-14T06:05:34.393+00:00","statement":{"source":"euvd","id":"EUVD-2026-60239","aliases":["CVE-2026-73646","GHSA-r28c-9q8g-f849"],"title":"PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(d…","description":"PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":null}],"references":["https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849","https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c","https://github.com/postcss/postcss/releases/tag/8.5.18"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-60239","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 17, 2026, 3:35:13 PM","dateUpdated":"Aug 17, 2026, 4:36:37 PM"},"relatedAdvisories":[{"id":"RHSA-2026:67540","title":"Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.13.12 security 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Hat Security Advisory: RHTAS 1.3.8 - Red Hat Trusted Artifact Signer Release","vulnerabilityIds":["CVE-2026-41178","CVE-2026-45736","CVE-2026-48779","CVE-2026-56854","CVE-2026-59869","CVE-2026-73086","CVE-2026-73088","CVE-2026-73089","CVE-2026-73500","CVE-2026-73646"]},{"id":"RHSA-2026:68765","title":"Red Hat Security Advisory: Technical preview of the satellite/iop-vulnerability-frontend-rhel9 container image","vulnerabilityIds":["CVE-2026-12143","CVE-2026-45819","CVE-2026-59879","CVE-2026-67313","CVE-2026-67314","CVE-2026-67320","CVE-2026-67321","CVE-2026-73088","CVE-2026-73089","CVE-2026-73646","CVE-2026-75931","CVE-2026-75975","CVE-2026-76172"]},{"id":"WID-SEC-W-2026-3596","title":"IBM App Connect Enterprise: Mehrere Schwachstellen","vulnerabilityIds":["CVE-2022-35948","CVE-2026-13149","CVE-2026-14257","CVE-2026-15157","CVE-2026-1527","CVE-2026-16728","CVE-2026-16729","CVE-2026-18149","CVE-2026-18540","CVE-2026-19534","CVE-2026-2391","CVE-2026-45820","CVE-2026-54272","CVE-2026-63670","CVE-2026-67213","CVE-2026-67214","CVE-2026-69152","CVE-2026-69192","CVE-2026-69198","CVE-2026-73566","CVE-2026-73646","CVE-2026-77037","CVE-2026-77063","CVE-2026-77078","CVE-2026-82333","CVE-2026-82417","CVE-2026-82562","CVE-2026-83605","CVE-2026-83606","CVE-2026-83607","CVE-2026-83608","CVE-2026-83609","CVE-2026-83610","CVE-2026-83611","CVE-2026-83612","CVE-2026-83613","CVE-2026-83614","CVE-2026-83615","CVE-2026-83616","CVE-2026-83618","CVE-2026-83619","CVE-2026-84292","CVE-2026-84371","CVE-2026-84375","CVE-2026-84890","CVE-2026-84933","CVE-2026-84947","CVE-2026-84961","CVE-2026-85008","CVE-2026-85014","CVE-2026-85024","CVE-2026-85152"]},{"id":"RHSA-2026:62260","title":"Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.30.0 Release.","vulnerabilityIds":["CVE-2025-55163","CVE-2026-8286","CVE-2026-9277","CVE-2026-9547","CVE-2026-9563","CVE-2026-10050","CVE-2026-10051","CVE-2026-12143","CVE-2026-12151","CVE-2026-13149","CVE-2026-15075","CVE-2026-15076","CVE-2026-27136","CVE-2026-34986","CVE-2026-39820","CVE-2026-39831","CVE-2026-39835","CVE-2026-40898","CVE-2026-40983","CVE-2026-40984","CVE-2026-41242","CVE-2026-41695","CVE-2026-41716","CVE-2026-42264","CVE-2026-42499","CVE-2026-44705","CVE-2026-45149","CVE-2026-45416","CVE-2026-45623","CVE-2026-45674","CVE-2026-46597","CVE-2026-46681","CVE-2026-47691","CVE-2026-48020","CVE-2026-48068","CVE-2026-48491","CVE-2026-49978","CVE-2026-50010","CVE-2026-50193","CVE-2026-53488","CVE-2026-53492","CVE-2026-53622","CVE-2026-54399","CVE-2026-54428","CVE-2026-54512","CVE-2026-54513","CVE-2026-54763","CVE-2026-55831","CVE-2026-55833","CVE-2026-56745","CVE-2026-56746","CVE-2026-56819","CVE-2026-59296","CVE-2026-59869","CVE-2026-59873","CVE-2026-59874","CVE-2026-59877","CVE-2026-59888","CVE-2026-59899","CVE-2026-65600","CVE-2026-65601","CVE-2026-67213","CVE-2026-67214","CVE-2026-68494","CVE-2026-69152","CVE-2026-69153","CVE-2026-73086","CVE-2026-73566","CVE-2026-73646","CVE-2026-75838"]},{"id":"RHSA-2026:68748","title":"Red 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Release.","vulnerabilityIds":["CVE-2026-4800","CVE-2026-45623","CVE-2026-45819","CVE-2026-47219","CVE-2026-48801","CVE-2026-54272","CVE-2026-55831","CVE-2026-55833","CVE-2026-56745","CVE-2026-56746","CVE-2026-56819","CVE-2026-59887","CVE-2026-59899","CVE-2026-67213","CVE-2026-67312","CVE-2026-67313","CVE-2026-67314","CVE-2026-67320","CVE-2026-67321","CVE-2026-69152","CVE-2026-69153","CVE-2026-69192","CVE-2026-71436","CVE-2026-73086","CVE-2026-73088","CVE-2026-73089","CVE-2026-73508","CVE-2026-73566","CVE-2026-73646","CVE-2026-75899","CVE-2026-75931","CVE-2026-75975","CVE-2026-76172","CVE-2026-82562","CVE-2026-84292","CVE-2026-84375","CVE-2026-84394"]},{"id":"RHSA-2026:67538","title":"Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.11.12 security update","vulnerabilityIds":["CVE-2026-27136","CVE-2026-41178","CVE-2026-42151","CVE-2026-42154","CVE-2026-42502","CVE-2026-48586","CVE-2026-55969","CVE-2026-56852","CVE-2026-66780","CVE-2026-71556","CVE-2026-73646"]},{"id":"RHSA-2026:86891","title":"Red Hat Security Advisory: RHOAI 3.5.2 - Red Hat OpenShift AI","vulnerabilityIds":["CVE-2024-14029","CVE-2026-13697","CVE-2026-15679","CVE-2026-15789","CVE-2026-18427","CVE-2026-19534","CVE-2026-37237","CVE-2026-49825","CVE-2026-49855","CVE-2026-54284","CVE-2026-56859","CVE-2026-59296","CVE-2026-59893","CVE-2026-62243","CVE-2026-62384","CVE-2026-63209","CVE-2026-63374","CVE-2026-66007","CVE-2026-68494","CVE-2026-68497","CVE-2026-69097","CVE-2026-69112","CVE-2026-69152","CVE-2026-69243","CVE-2026-69244","CVE-2026-71281","CVE-2026-71491","CVE-2026-73417","CVE-2026-73502","CVE-2026-73508","CVE-2026-73646","CVE-2026-75838","CVE-2026-75899","CVE-2026-75931","CVE-2026-75975","CVE-2026-76098","CVE-2026-76169","CVE-2026-76172","CVE-2026-76222","CVE-2026-76905","CVE-2026-77354","CVE-2026-77874","CVE-2026-78676","CVE-2026-78677","CVE-2026-78679","CVE-2026-78682","CVE-2026-79674","CVE-2026-79675","CVE-2026-80205","CVE-2026-81722","CVE-2026-81724","CVE-2026-81725","CVE-2026-81726","CVE-2026-81727","CVE-2026-82397","CVE-2026-82417","CVE-2026-84292","CVE-2026-84375","CVE-2026-84381","CVE-2026-84382","CVE-2026-84394","CVE-2026-84428","CVE-2026-84445","CVE-2026-84469","CVE-2026-84504","CVE-2026-84782","CVE-2026-84961","CVE-2026-85124","CVE-2026-85152","CVE-2026-85525","CVE-2026-86332","CVE-2026-87776","CVE-2026-87817","CVE-2026-87819","CVE-2026-88029","CVE-2026-88031","CVE-2026-89425","CVE-2026-91990","CVE-2026-93348","CVE-2026-93599","CVE-2026-93657","CVE-2026-93749","CVE-2026-96749","CVE-2026-96775","CVE-2026-102925","CVE-2026-102930","CVE-2026-102937","CVE-2026-102938","CVE-2026-102990","CVE-2026-104851","CVE-2026-104852","CVE-2026-104861","CVE-2026-104873"]},{"id":"RHSA-2026:54520","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","vulnerabilityIds":["CVE-2026-73086","CVE-2026-73646"]},{"id":"RHSA-2026:50287","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","vulnerabilityIds":["CVE-2026-69153","CVE-2026-72815","CVE-2026-73086","CVE-2026-73646"]},{"id":"RHSA-2026:68755","title":"Red Hat Security Advisory: Technical preview of the satellite/iop-vulnerability-frontend-rhel9 container image","vulnerabilityIds":["CVE-2026-12143","CVE-2026-45623","CVE-2026-45819","CVE-2026-67313","CVE-2026-67314","CVE-2026-67320","CVE-2026-67321","CVE-2026-73086","CVE-2026-73088","CVE-2026-73089","CVE-2026-73646","CVE-2026-75899","CVE-2026-75931","CVE-2026-75975","CVE-2026-76172"]},{"id":"RHSA-2026:68756","title":"Red Hat Security Advisory: General availability of the satellite/iop-host-inventory-frontend-rhel9 container image","vulnerabilityIds":["CVE-2026-59879","CVE-2026-73646","CVE-2026-75899","CVE-2026-75931","CVE-2026-75975","CVE-2026-76172","CVE-2026-84292","CVE-2026-84394"]},{"id":"WID-SEC-W-2026-4056","title":"Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye und Jira): Mehrere Schwachstellen","vulnerabilityIds":["CVE-2026-101898","CVE-2026-101901","CVE-2026-101903","CVE-2026-101905","CVE-2026-101906","CVE-2026-101907","CVE-2026-101909","CVE-2026-12185","CVE-2026-12802","CVE-2026-12860","CVE-2026-13006","CVE-2026-13676","CVE-2026-14682","CVE-2026-18036","CVE-2026-19534","CVE-2026-19693","CVE-2026-41842","CVE-2026-41845","CVE-2026-41850","CVE-2026-49434","CVE-2026-50750","CVE-2026-53404","CVE-2026-54399","CVE-2026-54428","CVE-2026-54512","CVE-2026-54513","CVE-2026-55153","CVE-2026-55831","CVE-2026-55833","CVE-2026-56624","CVE-2026-56745","CVE-2026-58061","CVE-2026-58062","CVE-2026-59641","CVE-2026-59645","CVE-2026-59651","CVE-2026-59903","CVE-2026-62243","CVE-2026-65182","CVE-2026-65183","CVE-2026-65637","CVE-2026-65927","CVE-2026-66422","CVE-2026-67213","CVE-2026-67214","CVE-2026-68494","CVE-2026-68495","CVE-2026-68497","CVE-2026-68498","CVE-2026-68525","CVE-2026-68569","CVE-2026-68763","CVE-2026-71888","CVE-2026-71889","CVE-2026-71891","CVE-2026-73086","CVE-2026-73507","CVE-2026-73508","CVE-2026-73634","CVE-2026-73635","CVE-2026-73646","CVE-2026-75140","CVE-2026-75595","CVE-2026-75596","CVE-2026-75975","CVE-2026-76172","CVE-2026-77185","CVE-2026-84292","CVE-2026-84375","CVE-2026-93488","CVE-2026-93491","CVE-2026-93558","CVE-2026-93690","CVE-2026-93748","CVE-2026-93994"]},{"id":"openSUSE-SU-2026:12070-1","title":"velociraptor-0.76.7.0.git145.b60ef1146-1.1 on GA media","vulnerabilityIds":["CVE-2025-0914","CVE-2026-12143","CVE-2026-14257","CVE-2026-17535","CVE-2026-18348","CVE-2026-18636","CVE-2026-18638","CVE-2026-18639","CVE-2026-18860","CVE-2026-27601","CVE-2026-29074","CVE-2026-41650","CVE-2026-45623","CVE-2026-49356","CVE-2026-5329","CVE-2026-53550","CVE-2026-55602","CVE-2026-56852","CVE-2026-59869","CVE-2026-6290","CVE-2026-64951","CVE-2026-64952","CVE-2026-64954","CVE-2026-65903","CVE-2026-65912","CVE-2026-65913","CVE-2026-65914","CVE-2026-67314","CVE-2026-67320","CVE-2026-6863","CVE-2026-69152","CVE-2026-69153","CVE-2026-6948","CVE-2026-73086","CVE-2026-73646","CVE-2026-73650","CVE-2026-7572","CVE-2026-7573","CVE-2026-84369","CVE-2026-84370"]},{"id":"RHSA-2026:68681","title":"Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.8.17 update","vulnerabilityIds":["CVE-2026-14257","CVE-2026-16221","CVE-2026-27145","CVE-2026-33186","CVE-2026-33818","CVE-2026-42504","CVE-2026-56852","CVE-2026-56853","CVE-2026-56859","CVE-2026-56860","CVE-2026-56862","CVE-2026-59869","CVE-2026-59873","CVE-2026-59874","CVE-2026-67313","CVE-2026-67314","CVE-2026-67320","CVE-2026-67321","CVE-2026-69152","CVE-2026-69192","CVE-2026-73088","CVE-2026-73089","CVE-2026-73566","CVE-2026-73643","CVE-2026-73646","CVE-2026-75899","CVE-2026-75931","CVE-2026-75975","CVE-2026-76172","CVE-2026-76844","CVE-2026-82417","CVE-2026-84292","CVE-2026-84375","CVE-2026-84394"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-60239","identifiers":["EUVD-2026-60239","CVE-2026-73646","GHSA-r28c-9q8g-f849"]},"retained":false,"historicalAffected":[]},{"revision":"ec9eb6f894754cbda14b33e76b794b38","observedAt":"2026-10-25T15:19:09.409+00:00","statement":{"source":"nvd","id":"CVE-2026-73646","aliases":[],"title":"PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(d…","description":"PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.","state":0,"publishedAt":"2026-08-17T16:17:47.257+00:00","modifiedAt":"2026-09-18T20:05:53.723+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c","https://github.com/postcss/postcss/releases/tag/8.5.18","https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73646","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-22"],"productCriteria":[],"sourceDates":{"published":"2026-08-17T16:17:47.257","lastModified":"2026-09-18T20:05:53.723"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-73646","identifiers":["CVE-2026-73646"]},"retained":false,"historicalAffected":[]},{"revision":"3eabd647cf2244da921d5b1132530aab","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-r28c-9q8g-f849","aliases":["CVE-2026-73646"],"title":"PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure","description":"## Vulnerability Details\n\n**File**: `lib/previous-map.js`\n**Line**: 87-98 (`loadFile`), 129-144 (`loadMap`)\n\n\n### Root Cause\nPostCSS auto-detects a `/*# sourceMappingURL=... */` comment inside the CSS text it is asked to parse and, unless the caller explicitly passes `map: false`, attempts to load that path from disk as a \"previous source map.\" This happens on every `postcss.parse()` / `postcss().process()` call by default (opt-out, not opt-in).\n\n`loadMap()` builds the candidate path via `join(dirname(opts.from), annotation)`, where `annotation` is the raw, attacker-controlled string from the CSS comment. `path.join()` normalizes but does not sandbox `..` segments, so a `../../../` prefix walks the resolved path outside the intended directory. If `opts.from` is not set at all, the annotation is used completely unmodified — an absolute path in the CSS comment is read verbatim.\n\n8.5.12 already fixed a strictly worse variant of this (any file, any extension, could be read) by requiring the resolved path to end in `.map` (`loadFile()`). That fix did not address the traversal itself, only the target extension. Since the `join(dirname(file), map)` logic has existed unchanged since PostCSS 8.0.0 (Feb 2020), any file ending in `.map` remains readable through this path in the current release (8.5.16).\n\nOnce loaded, `MapGenerator.isMap()` treats the mere presence of a loaded \"previous map\" as an implicit request to generate `result.map`, even when the caller never set the `map` option. If the loaded map has a `sourcesContent` field (common for maps emitted by bundlers/transpilers), that content is merged into `result.map` and returned to the caller — disclosing the traversed-to file's content to whoever supplied the CSS.\n\n### Attack Scenario\n1. A service accepts user-submitted CSS and runs it through PostCSS to lint/format/transform it, e.g. `postcss().process(userCss, { from: '/app/uploads/user123/input.css', to: '/app/uploads/user123/output.css' })` — idiomatic usage; `map` option untouched.\n2. Attacker submits CSS containing `/*# sourceMappingURL=../../../../some/other/app/dist/bundle.js.map */` (or an absolute path if `from` is unset).\n3. PostCSS reads that `.map` file and folds its `sourcesContent` into `result.map`.\n4. The service does what most build pipelines do with a truthy `result.map` — writes it next to the CSS output or returns it via API (source maps are meant to be consumed by browser devtools, so this is commonly public/served).\n5. Attacker retrieves the emitted map and reads out the traversed file's content.\n\n### Impact\nDisclosure of the contents of arbitrary `.map` files reachable via path traversal (or absolute path when `from` is unset) from the process's filesystem. Affects any application processing CSS it does not fully trust without explicitly passing `map: false`. No authentication or user interaction beyond submitting CSS text is required.\n\n### Vulnerable Code\n```js\nloadFile(path, cssFile, trusted) {\n  if (!trusted && !this.unsafeMap) {\n    if (!/\\.map$/i.test(path)) {\n      return undefined\n    }\n  }\n  this.root = dirname(path)\n  if (existsSync(path)) {\n    this.mapFile = path\n    return readFileSync(path, 'utf-8').toString().trim()\n  }\n}\n\nloadMap(file, prev) {\n  ...\n  } else if (this.annotation) {\n    let map = this.annotation\n    if (file) map = join(dirname(file), map)\n    let unknown = this.loadFile(map, file, false)\n    ...\n  }\n}\n```\n\n### Recommended Fix\nConstrain the resolved path to remain inside the CSS file's own directory instead of relying solely on a filename-extension check:\n```js\nloadFile(path, cssFile, trusted) {\n  if (!trusted && !this.unsafeMap) {\n    if (!/\\.map$/i.test(path)) {\n      return undefined\n    }\n    if (!cssFile) return undefined\n    let root = resolve(dirname(cssFile))\n    let resolvedPath = resolve(root, path)\n    if (resolvedPath !== root && !resolvedPath.startsWith(root + sep)) {\n      return undefined\n    }\n  }\n  this.root = dirname(path)\n  if (existsSync(path)) {\n    this.mapFile = path\n    return readFileSync(path, 'utf-8').toString().trim()\n  }\n}\n```\nI've implemented, tested (full existing test suite — 660/660 passing, plus new PoC-based regression checks for both the traversal and legitimate same-directory cases), and can share this fix on request or via a private fork if invited.\n\n### Verification\nDynamically confirmed on v8.5.16 (current npm release / repo HEAD) via a standalone Node.js harness against `lib/postcss.js`: a \"secret\" `.map` file placed two directories outside a simulated project directory was read via a crafted `sourceMappingURL` comment in otherwise-innocuous CSS, with its `sourcesContent` appearing verbatim in `result.map.toString()` — with no `map` option set by the caller. A second harness confirmed the simpler no-`from` case reads an absolute path directly. A third harness confirmed `map: false` is the only current workaround. The attached fix branch closes both vectors while keeping all 660 existing unit tests green.","state":0,"publishedAt":"2026-07-24T16:24:55+00:00","modifiedAt":"2026-09-10T03:50:52.8545377+00:00","affected":[{"ecosystem":"npm","name":"postcss","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"8.5.18"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849","https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c","https://github.com/postcss/postcss","https://github.com/postcss/postcss/releases/tag/8.5.18"],"sourceUrl":"https://github.com/advisories/GHSA-r28c-9q8g-f849","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-r28c-9q8g-f849","identifiers":["GHSA-r28c-9q8g-f849","CVE-2026-73646"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-15T12:00:55.3946839+00:00","complete":true,"records":1781,"lastAttemptAt":"2026-11-15T12:00:55.3946839+00:00","lastSuccessAt":"2026-11-15T12:00:55.579435+00:00","error":null,"lastVerifiedAt":"2026-11-15T12:00:55.5794357+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-7de4d7559a5263003f03d9f70577ab06f92ba4178309f26fce53e22a4a959294-9f2801eea6d0b63da2583193add6be220e1b53bbbe4ef94b9346425ef1596ca8","complete":true,"records":425788,"lastAttemptAt":"2026-11-15T12:00:54.4294537+00:00","lastSuccessAt":"2026-11-15T12:00:54.4082037+00:00","error":null,"lastVerifiedAt":"2026-11-15T12:00:54.4294537+00:00","snapshotPublishedAt":"2026-11-15T11:26:58+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-850c26e23e9a454eb8654cf34d45fa51","complete":false,"records":13821,"lastAttemptAt":"2026-11-15T12:10:42.9128167+00:00","lastSuccessAt":"2026-11-15T12:10:42.908+00:00","error":"92 identifier lookups failed; latest failures include AccessDenied (HTTP 403). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-15T12:10:42.908+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13568,"expectedIdentifiers":13874,"failedIdentifiers":92},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-15T12:00:55.3946839+00:00","complete":true,"records":1125,"lastAttemptAt":"2026-11-15T12:00:55.3946839+00:00","lastSuccessAt":"2026-11-15T12:00:55.580236+00:00","error":null,"lastVerifiedAt":"2026-11-15T12:00:55.580236+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-d33b5144615b488f88b7a7390696bc39","complete":false,"records":13833,"lastAttemptAt":"2026-11-15T12:01:03.1788889+00:00","lastSuccessAt":"2026-11-15T10:02:36.038+00:00","error":"1 identifier lookups failed; latest failures include HttpError (HTTP 503). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-15T10:02:36.038+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13873,"expectedIdentifiers":13874,"failedIdentifiers":1},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-64eea06dbd27de8464d5dbce1b78cc794cc59e2d901516ae0d3ea76e624cdae0","complete":true,"records":9955,"lastAttemptAt":"2026-11-15T12:00:55.0947737+00:00","lastSuccessAt":"2026-11-14T13:57:23.1208135+00:00","error":null,"lastVerifiedAt":"2026-11-15T12:00:55.0947737+00:00","snapshotPublishedAt":"2026-11-14T13:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-f4424d7d4861b1af1404bd15abcb83f295dcd003412a9340ca99dc8200aa148a","complete":true,"records":2014,"lastAttemptAt":"2026-11-15T12:00:54.588948+00:00","lastSuccessAt":"2026-11-13T19:57:08.2864435+00:00","error":null,"lastVerifiedAt":"2026-11-15T12:00:54.588948+00:00","snapshotPublishedAt":"2026-11-13T19:33:10+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-6086d649bcb454cdf302d7d9275177bda73550e1b6e446b3520e9b6266d3582c","complete":true,"records":3148,"lastAttemptAt":"2026-11-15T12:00:55.3229475+00:00","lastSuccessAt":"2026-11-15T11:05:17.1034234+00:00","error":null,"lastVerifiedAt":"2026-11-15T12:00:55.3229475+00:00","snapshotPublishedAt":"2026-11-15T10:03:04+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-ff18f36f13fcca3a20a3fb9274b59b8872d18869a99071730e1e79b625c8f612","complete":true,"records":232475,"lastAttemptAt":"2026-11-15T12:00:54.6916951+00:00","lastSuccessAt":"2026-11-15T11:05:10.4195883+00:00","error":null,"lastVerifiedAt":"2026-11-15T12:00:54.6916951+00:00","snapshotPublishedAt":"2026-11-15T10:33:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}