{"id":"CVE-2026-59887","revision":null,"records":[{"revision":"81ab3cd78bc444e8b77e0836d068fa81","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-59887","aliases":[],"title":"linkify-it: Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text","description":"linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.","state":0,"publishedAt":"2026-07-08T15:58:12.114+00:00","modifiedAt":"2026-07-09T14:41:02.113+00:00","affected":[{"ecosystem":"Vendor product","name":"linkify-it","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"markdown-it\",\n                    \"product\": \"linkify-it\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 5.0.2\",\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:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm","https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe","https://github.com/markdown-it/linkify-it/releases/tag/5.0.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-59887","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-59887","identifiers":["CVE-2026-59887"]},"retained":false,"historicalAffected":[]},{"revision":"1734d55d0204449dbec554896cd0b81b","observedAt":"2026-11-07T13:26:01.083+00:00","statement":{"source":"euvd","id":"EUVD-2026-42321","aliases":["CVE-2026-59887","GHSA-v245-v573-v5vm"],"title":"linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in…","description":"linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.","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:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm","https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe","https://github.com/markdown-it/linkify-it/releases/tag/5.0.2"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-42321","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jul 8, 2026, 3:58:12 PM","dateUpdated":"Jul 9, 2026, 2:41:02 PM"},"relatedAdvisories":[{"id":"RHSA-2026:74609","title":"Red Hat Security Advisory: Cluster Observability Operator 1.5.3","vulnerabilityIds":["CVE-2026-19534","CVE-2026-39244","CVE-2026-41178","CVE-2026-42504","CVE-2026-45623","CVE-2026-56864","CVE-2026-56865","CVE-2026-59887","CVE-2026-63199","CVE-2026-71556","CVE-2026-73086","CVE-2026-75899","CVE-2026-75931","CVE-2026-75975","CVE-2026-76172","CVE-2026-84292","CVE-2026-84394","CVE-2026-84445","CVE-2026-84961","CVE-2026-92000","CVE-2026-100690"]},{"id":"NCSC-2026-0325","title":"Kwetsbaarheden verholpen in Atlassian producten","vulnerabilityIds":["CVE-2021-44906","CVE-2022-3517","CVE-2023-45133","CVE-2025-14813","CVE-2026-0603","CVE-2026-2332","CVE-2026-3505","CVE-2026-4800","CVE-2026-6321","CVE-2026-6322","CVE-2026-10050","CVE-2026-12143","CVE-2026-12151","CVE-2026-12802","CVE-2026-12803","CVE-2026-12816","CVE-2026-13149","CVE-2026-13506","CVE-2026-13676","CVE-2026-14257","CVE-2026-14682","CVE-2026-16221","CVE-2026-18446","CVE-2026-21582","CVE-2026-24734","CVE-2026-25639","CVE-2026-27601","CVE-2026-27606","CVE-2026-29786","CVE-2026-40983","CVE-2026-40984","CVE-2026-41284","CVE-2026-41842","CVE-2026-41845","CVE-2026-41850","CVE-2026-41851","CVE-2026-41907","CVE-2026-42033","CVE-2026-42035","CVE-2026-42041","CVE-2026-42198","CVE-2026-42583","CVE-2026-42587","CVE-2026-43513","CVE-2026-44249","CVE-2026-44486","CVE-2026-44487","CVE-2026-44488","CVE-2026-44490","CVE-2026-44492","CVE-2026-44494","CVE-2026-44495","CVE-2026-44496","CVE-2026-45416","CVE-2026-45623","CVE-2026-46625","CVE-2026-47838","CVE-2026-48043","CVE-2026-48779","CVE-2026-48801","CVE-2026-50010","CVE-2026-53434","CVE-2026-54291","CVE-2026-54512","CVE-2026-54513","CVE-2026-55685","CVE-2026-55831","CVE-2026-55833","CVE-2026-56745","CVE-2026-56819","CVE-2026-58059","CVE-2026-58060","CVE-2026-59639","CVE-2026-59642","CVE-2026-59869","CVE-2026-59871","CVE-2026-59873","CVE-2026-59874","CVE-2026-59887","CVE-2026-59901","CVE-2026-67320","CVE-2026-69152","CVE-2026-69192"]},{"id":"RHSA-2026:83662","title":"Red Hat Security Advisory: MTV RHEL9 Images","vulnerabilityIds":["CVE-2026-50162","CVE-2026-56852","CVE-2026-59887","CVE-2026-84445","CVE-2026-88031"]},{"id":"RHSA-2026:83663","title":"Red Hat Security Advisory: MTV RHEL9 Images","vulnerabilityIds":["CVE-2026-50162","CVE-2026-56852","CVE-2026-59887","CVE-2026-84445"]},{"id":"RHSA-2026:89715","title":"Red Hat Security Advisory: OpenShift Container Platform 4.16.74 bug fix and security update","vulnerabilityIds":["CVE-2024-24786","CVE-2026-14362","CVE-2026-33814","CVE-2026-39829","CVE-2026-42151","CVE-2026-46597","CVE-2026-49329","CVE-2026-59887","CVE-2026-75888","CVE-2026-83589","CVE-2026-84292","CVE-2026-93017","CVE-2026-111943"]},{"id":"WID-SEC-W-2026-2923","title":"Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye, und Jira): Mehrere Schwachstellen","vulnerabilityIds":["CVE-2019-13990","CVE-2021-44906","CVE-2022-1471","CVE-2022-23521","CVE-2022-3517","CVE-2022-41903","CVE-2023-22518","CVE-2023-22522","CVE-2023-22523","CVE-2023-22524","CVE-2023-22527","CVE-2023-45133","CVE-2023-46604","CVE-2025-14813","CVE-2026-0603","CVE-2026-10050","CVE-2026-12143","CVE-2026-12151","CVE-2026-12802","CVE-2026-12803","CVE-2026-12816","CVE-2026-13149","CVE-2026-13506","CVE-2026-13676","CVE-2026-14257","CVE-2026-14682","CVE-2026-16221","CVE-2026-18446","CVE-2026-21582","CVE-2026-2332","CVE-2026-24734","CVE-2026-25639","CVE-2026-27601","CVE-2026-27606","CVE-2026-29786","CVE-2026-3505","CVE-2026-40983","CVE-2026-40984","CVE-2026-41284","CVE-2026-41842","CVE-2026-41845","CVE-2026-41850","CVE-2026-41851","CVE-2026-41907","CVE-2026-42033","CVE-2026-42035","CVE-2026-42041","CVE-2026-42198","CVE-2026-42583","CVE-2026-42587","CVE-2026-43513","CVE-2026-44249","CVE-2026-44486","CVE-2026-44487","CVE-2026-44488","CVE-2026-44490","CVE-2026-44492","CVE-2026-44494","CVE-2026-44495","CVE-2026-44496","CVE-2026-45416","CVE-2026-45623","CVE-2026-46625","CVE-2026-47838","CVE-2026-4800","CVE-2026-48043","CVE-2026-48779","CVE-2026-48801","CVE-2026-50010","CVE-2026-53434","CVE-2026-54291","CVE-2026-54512","CVE-2026-54513","CVE-2026-55685","CVE-2026-55831","CVE-2026-55833","CVE-2026-56745","CVE-2026-56819","CVE-2026-58059","CVE-2026-58060","CVE-2026-59639","CVE-2026-59642","CVE-2026-59869","CVE-2026-59871","CVE-2026-59873","CVE-2026-59874","CVE-2026-59887","CVE-2026-59901","CVE-2026-6321","CVE-2026-6322","CVE-2026-67320","CVE-2026-69152","CVE-2026-69192"]},{"id":"RHSA-2026:89839","title":"Red Hat Security Advisory: OpenShift Container Platform 4.14.77 bug fix and security update","vulnerabilityIds":["CVE-2026-14362","CVE-2026-33814","CVE-2026-39821","CVE-2026-55204","CVE-2026-59887","CVE-2026-111943"]},{"id":"RHSA-2026:90321","title":"Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.31.0 Release.","vulnerabilityIds":["CVE-2023-54404","CVE-2025-62718","CVE-2026-8643","CVE-2026-9496","CVE-2026-12185","CVE-2026-13697","CVE-2026-14682","CVE-2026-15076","CVE-2026-16308","CVE-2026-17106","CVE-2026-18427","CVE-2026-19203","CVE-2026-19534","CVE-2026-39820","CVE-2026-41178","CVE-2026-41707","CVE-2026-42499","CVE-2026-42502","CVE-2026-45416","CVE-2026-47884","CVE-2026-47886","CVE-2026-47888","CVE-2026-47890","CVE-2026-47892","CVE-2026-50010","CVE-2026-55831","CVE-2026-55833","CVE-2026-55851","CVE-2026-56745","CVE-2026-56746","CVE-2026-56819","CVE-2026-56852","CVE-2026-56854","CVE-2026-58062","CVE-2026-59280","CVE-2026-59282","CVE-2026-59283","CVE-2026-59296","CVE-2026-59313","CVE-2026-59323","CVE-2026-59651","CVE-2026-59887","CVE-2026-59899","CVE-2026-59901","CVE-2026-62243","CVE-2026-64607","CVE-2026-67213","CVE-2026-67312","CVE-2026-67313","CVE-2026-67314","CVE-2026-67320","CVE-2026-67321","CVE-2026-68494","CVE-2026-68497","CVE-2026-69152","CVE-2026-69192","CVE-2026-71290","CVE-2026-71324","CVE-2026-71325","CVE-2026-71327","CVE-2026-73500","CVE-2026-73508","CVE-2026-74835","CVE-2026-75838","CVE-2026-75899","CVE-2026-75931","CVE-2026-76169","CVE-2026-81521","CVE-2026-82417","CVE-2026-82562","CVE-2026-84292","CVE-2026-84375","CVE-2026-84394","CVE-2026-84428","CVE-2026-84445","CVE-2026-84469","CVE-2026-84504","CVE-2026-84961","CVE-2026-85062","CVE-2026-85124","CVE-2026-85152","CVE-2026-85595","CVE-2026-85597","CVE-2026-86063","CVE-2026-87743","CVE-2026-88004","CVE-2026-88007","CVE-2026-88008","CVE-2026-88009","CVE-2026-88011","CVE-2026-88012","CVE-2026-88031","CVE-2026-88878","CVE-2026-88879","CVE-2026-90711","CVE-2026-93749","CVE-2026-100655","CVE-2026-100656","CVE-2026-100666","CVE-2026-101916","CVE-2026-102925","CVE-2026-102930","CVE-2026-103435","CVE-2026-109618","CVE-2026-109619"]},{"id":"RHSA-2026:68754","title":"Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.30.1 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"]}],"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-2026-42321","identifiers":["EUVD-2026-42321","CVE-2026-59887","GHSA-v245-v573-v5vm"]},"retained":false,"historicalAffected":[]},{"revision":"cfe86e350e564c2cb2eab5f897131810","observedAt":"2026-10-27T15:15:33.457+00:00","statement":{"source":"nvd","id":"CVE-2026-59887","aliases":[],"title":"linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in…","description":"linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.","state":0,"publishedAt":"2026-07-08T17:17:26.883+00:00","modifiedAt":"2026-10-25T17:10:00.197+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:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe","https://github.com/markdown-it/linkify-it/releases/tag/5.0.2","https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59887","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-407"],"productCriteria":["cpe:2.3:a:markdown-it:linkify-it:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-07-08T17:17:26.883","lastModified":"2026-10-25T17:10:00.197"},"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-2026-59887","identifiers":["CVE-2026-59887"]},"retained":false,"historicalAffected":[]},{"revision":"7118919e51f84c48b8c1a57c60dbd331","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-v245-v573-v5vm","aliases":["CVE-2026-59887"],"title":"linkify-it: Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text","description":"### Summary\n`linkify-it`'s schema-scan loop (`.test()` / `.match()`, the documented public API) invokes the `mailto:`\nschema validator at **every** `mailto:` occurrence in the input text. For each occurrence the validator does\n`text.slice(pos)` (an O(n) copy) and runs an email regex whose local-part class `src_email_name` greedily\nscans the **entire remaining tail** (O(n)) before failing. With N `mailto:` occurrences that is\n**N × O(n) = O(n²)**. Because linkify-it runs on arbitrary user text (markdown-it feeds it whole documents\nwhen `linkify:true`), an unauthenticated attacker can block the single-threaded event loop for many seconds\nwith a small input. No length bound (unlike an HTTP header).\n\n### Root cause — `index.mjs` + `lib/re.mjs`\n```js\n// index.mjs (mailto validator) — runs at every \"mailto:\" hit\n'mailto:': { validate: function (text, pos, self) {\n  const tail = text.slice(pos)                                  // O(n) copy per hit\n  if (!self.re.mailto) self.re.mailto = new RegExp('^' + self.re.src_email_name + '@' + self.re.src_host_strict, 'i')\n  if (self.re.mailto.test(tail)) { ... }                        // scans the whole O(n) tail\n  return 0\n}}\n// lib/re.mjs:91-93 — every char of \"mailto:\" (incl. ':','-',';') is in this class:\nre.src_email_name = '[\\\\-;:&=\\\\+\\\\$,\\\\.a-zA-Z0-9_][\\\\-;:&=\\\\+\\\\$,\\\\\"\\\\.a-zA-Z0-9_]*'\n```\nThe `while ((m = re.exec(text)) !== null) { …testSchemaAt… }` scan loop calls the validator at each\n`mailto:` hit; `src_email_name` greedily consumes the whole tail (all chars are in its class) then fails for\nlack of `@`. `http:`/`https:` do NOT blow up — their validator requires the tail to start with `//`, failing\nin O(1) per hit.\n\n### Proof of Concept (confirmed, linkify-it 5.0.1, Node v24)\n```js\nconst LinkifyIt = require('linkify-it');\nconst lf = new LinkifyIt();\nlf.match('mailto:'.repeat(48000));   // ~336 KB of \"mailto:mailto:…\" -> seconds of blocked event loop\n```\n| input (same bytes) | 56 KB | 112 KB | 224 KB | 336 KB |\n|---|---:|---:|---:|---:|\n| **`mailto:` contiguous** | 97 ms | 357 ms | 1438 ms | 3272 ms |\n| `mailto:` space-separated | 2 ms | 3 ms | 5 ms | 8 ms |\n| `http://` contiguous | 12 ms | 17 ms | 33 ms | 49 ms |\n\n×~4 per 2× input ⇒ O(n²); equal-byte controls stay flat ⇒ algorithmic, not a GC/allocation artifact.\nReal-world via markdown-it 14.x (`{linkify:true}`), `md.render('mailto:'.repeat(n))`: 219 KB ≈ ~5 s.\n<img width=\"737\" height=\"161\" alt=\"image\" src=\"https://github.com/user-attachments/assets/b5d390f3-68d0-4861-9c47-ad8aff0203d5\" />\n\n### Impact\nReachable on arbitrary user text via the documented `.test()`/`.match()` API and through markdown-it's\nlinkifier — comment systems, chat, forums, wikis, note apps that render user markdown with linkify enabled.\nA ~220 KB post hangs the event loop ~5 s; a few hundred KB → tens of seconds. Availability only.\n\n### Suggested remediation\nBound the email local-part per RFC 5321 (≤64) so per-hit work is O(1), and avoid the full-tail slice:\n```js\n// lib/re.mjs — cap the greedy run:\nre.src_email_name = '[\\\\-;:&=\\\\+\\\\$,\\\\.a-zA-Z0-9_][\\\\-;:&=\\\\+\\\\$,\\\\\"\\\\.a-zA-Z0-9_]{0,63}'\n// index.mjs — prefer a sticky regex anchored at `pos` over text.slice(pos).\n```\n\n### Affected / disclosure\nAll versions through 5.0.1 (latest); same code on `master`. cve-mcp/OSV report no known vulnerability for\nlinkify-it. Distinct from markdown-it's own `*`-run ReDoS (CVE-2026-2327, different package/path) and the\nrecent markdown-it DoS. Reported privately; happy to test a patch against the PoC.","state":0,"publishedAt":"2026-07-21T19:06:09+00:00","modifiedAt":"2026-09-10T03:51:12.0541794+00:00","affected":[{"ecosystem":"npm","name":"linkify-it","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"5.0.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/markdown-it/linkify-it/security/advisories/GHSA-v245-v573-v5vm","https://nvd.nist.gov/vuln/detail/CVE-2026-59887","https://github.com/markdown-it/linkify-it/commit/105e5d77f7d119871d2b2d86ed208568eb3e7ffe","https://github.com/markdown-it/linkify-it","https://github.com/markdown-it/linkify-it/releases/tag/5.0.2"],"sourceUrl":"https://github.com/advisories/GHSA-v245-v573-v5vm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-v245-v573-v5vm","identifiers":["GHSA-v245-v573-v5vm","CVE-2026-59887"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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