{"id":"GHSA-83g3-92jg-28cx","revision":null,"records":[{"revision":"bed7190a13de4f2091581f569ec81445","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-26960","aliases":[],"title":"node-tar has Arbitrary File Read/Write via Hardlink Target Escape Through Symlink Chain in Extraction","description":"node-tar is a full-featured Tar for Node.js. When using default options in versions 7.5.7 and below, an attacker-controlled archive can create a hardlink inside the extraction directory that points to a file outside the extraction root, enabling arbitrary file read and write as the extracting user. Severity is high because the primitive bypasses path protections and turns archive extraction into a direct filesystem access primitive. This issue has been fixed in version 7.5.8.","state":0,"publishedAt":"2026-02-20T01:07:52.979+00:00","modifiedAt":"2026-02-20T15:35:27.586+00:00","affected":[{"ecosystem":"Vendor product","name":"node-tar","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"isaacs\",\n                    \"product\": \"node-tar\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 7.5.8\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":7.1,"severity":"HIGH"}],"references":["https://github.com/isaacs/node-tar/security/advisories/GHSA-83g3-92jg-28cx","https://github.com/isaacs/node-tar/commit/2cb1120bcefe28d7ecc719b41441ade59c52e384","https://github.com/isaacs/node-tar/commit/d18e4e1f846f4ddddc153b0f536a19c050e7499f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-26960","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-26960","identifiers":["CVE-2026-26960"]},"retained":false,"historicalAffected":[]},{"revision":"7a6a863ebf19415197890dc08a381e88","observedAt":"2026-11-15T08:35:41.365+00:00","statement":{"source":"euvd","id":"EUVD-2026-8399","aliases":["CVE-2026-26960","GHSA-83g3-92jg-28cx"],"title":"node-tar is a full-featured Tar for Node.js. When using default options in versions 7.5.7 and below, an attacker-controlled archive can create a hardlink inside the extraction directory that points to a file outside the extraction root, ena…","description":"node-tar is a full-featured Tar for Node.js. When using default options in versions 7.5.7 and below, an attacker-controlled archive can create a hardlink inside the extraction directory that points to a file outside the extraction root, enabling arbitrary file read and write as the extracting user. Severity is high because the primitive bypasses path protections and turns archive extraction into a direct filesystem access primitive. This issue has been fixed in version 7.5.8.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":7.1,"severity":null}],"references":["https://github.com/isaacs/node-tar/security/advisories/GHSA-83g3-92jg-28cx","https://github.com/isaacs/node-tar/commit/2cb1120bcefe28d7ecc719b41441ade59c52e384","https://github.com/isaacs/node-tar/commit/d18e4e1f846f4ddddc153b0f536a19c050e7499f"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-8399","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Feb 20, 2026, 1:07:52 AM","dateUpdated":"Feb 20, 2026, 3:35:27 PM"},"relatedAdvisories":[{"id":"WID-SEC-W-2026-2451","title":"Oracle Siebel CRM: Mehrere Schwachstellen","vulnerabilityIds":["CVE-2021-3283","CVE-2023-40577","CVE-2024-39908","CVE-2025-12383","CVE-2025-13837","CVE-2025-26791","CVE-2025-5222","CVE-2025-59250","CVE-2025-67030","CVE-2025-67721","CVE-2025-68480","CVE-2025-9624","CVE-2026-1229","CVE-2026-1605","CVE-2026-22732","CVE-2026-22737","CVE-2026-24051","CVE-2026-24308","CVE-2026-24400","CVE-2026-24734","CVE-2026-26007","CVE-2026-26960","CVE-2026-27205","CVE-2026-33186","CVE-2026-34478","CVE-2026-34500","CVE-2026-34520","CVE-2026-35204","CVE-2026-40179","CVE-2026-47011","CVE-2026-47016","CVE-2026-47018","CVE-2026-47032","CVE-2026-47036","CVE-2026-60357","CVE-2026-60689","CVE-2026-60690","CVE-2026-60704","CVE-2026-60705","CVE-2026-60709","CVE-2026-60711","CVE-2026-60712","CVE-2026-60713"]},{"id":"RHSA-2026:6428","title":"Red Hat Security Advisory: Network Observability 1.11.1 for OpenShift","vulnerabilityIds":["CVE-2025-61726","CVE-2025-61728","CVE-2025-61729","CVE-2025-68121","CVE-2026-25639","CVE-2026-26960","CVE-2026-29063","CVE-2026-33186"]},{"id":"WID-SEC-W-2026-1608","title":"Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye und Jira): Mehrere Schwachstellen","vulnerabilityIds":["CVE-2019-13990","CVE-2022-1471","CVE-2022-23521","CVE-2022-41903","CVE-2023-22518","CVE-2023-22522","CVE-2023-22523","CVE-2023-22524","CVE-2023-22527","CVE-2023-24998","CVE-2023-46604","CVE-2024-45801","CVE-2025-52999","CVE-2025-67030","CVE-2026-22029","CVE-2026-22732","CVE-2026-24734","CVE-2026-24880","CVE-2026-25639","CVE-2026-26960","CVE-2026-27727","CVE-2026-27830","CVE-2026-29062","CVE-2026-29129","CVE-2026-29145","CVE-2026-29146","CVE-2026-29786","CVE-2026-31802","CVE-2026-33750","CVE-2026-34483","CVE-2026-34487","CVE-2026-39304","CVE-2026-42198","CVE-2026-5598"]},{"id":"msrc_CVE-2026-26960","title":"node-tar has Arbitrary File Read/Write via Hardlink Target Escape Through Symlink Chain in Extraction","vulnerabilityIds":["CVE-2026-26960"]},{"id":"WID-SEC-W-2026-3461","title":"HCL BigFix Service Management: Mehrere Schwachstellen","vulnerabilityIds":["CVE-2026-18963","CVE-2026-67100","CVE-2026-67101","CVE-2026-67102","CVE-2026-67103","CVE-2026-21806","CVE-2026-21848","CVE-2026-23950","CVE-2026-26960","CVE-2026-56590","CVE-2026-56592","CVE-2026-56595","CVE-2026-56597","CVE-2026-73086"]},{"id":"RHSA-2026:5447","title":"Red Hat Security Advisory: RHTAS 1.3.3 - Red Hat Trusted Artifact Signer Release","vulnerabilityIds":["CVE-2025-61726","CVE-2025-61728","CVE-2026-24842","CVE-2026-26960"]},{"id":"RHSA-2026:6192","title":"Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.27.0 Release.","vulnerabilityIds":["CVE-2025-13465","CVE-2025-54386","CVE-2025-61726","CVE-2025-61728","CVE-2025-61729","CVE-2025-64756","CVE-2025-68121","CVE-2025-69873","CVE-2026-1002","CVE-2026-22045","CVE-2026-23745","CVE-2026-23950","CVE-2026-24049","CVE-2026-24842","CVE-2026-25223","CVE-2026-25639","CVE-2026-25949","CVE-2026-26960","CVE-2026-26996"]},{"id":"WID-SEC-W-2026-1229","title":"Atlassian Bamboo, Bitbucket, Confluence, Jira: Mehrere Schwachstellen","vulnerabilityIds":["CVE-2021-0341","CVE-2021-31597","CVE-2022-1471","CVE-2022-25927","CVE-2023-1370","CVE-2023-3635","CVE-2023-48631","CVE-2024-29371","CVE-2024-45801","CVE-2024-47875","CVE-2025-48734","CVE-2025-66020","CVE-2026-21571","CVE-2026-22029","CVE-2026-23745","CVE-2026-23950","CVE-2026-24734","CVE-2026-24842","CVE-2026-24880","CVE-2026-25547","CVE-2026-25639","CVE-2026-26960","CVE-2026-29063","CVE-2026-31802","CVE-2026-33870","CVE-2026-33871","CVE-2026-34487"]}],"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-2026-8399","identifiers":["EUVD-2026-8399","CVE-2026-26960","GHSA-83g3-92jg-28cx"]},"retained":false,"historicalAffected":[]},{"revision":"4c4cfd5a16cc49079b72011e35e5ce93","observedAt":"2026-10-25T06:17:28.833+00:00","statement":{"source":"nvd","id":"CVE-2026-26960","aliases":[],"title":"node-tar is a full-featured Tar for Node.js. When using default options in versions 7.5.7 and below, an attacker-controlled archive can create a hardlink inside the extraction directory that points to a file outside the extraction root, ena…","description":"node-tar is a full-featured Tar for Node.js. When using default options in versions 7.5.7 and below, an attacker-controlled archive can create a hardlink inside the extraction directory that points to a file outside the extraction root, enabling arbitrary file read and write as the extracting user. Severity is high because the primitive bypasses path protections and turns archive extraction into a direct filesystem access primitive. This issue has been fixed in version 7.5.8.","state":0,"publishedAt":"2026-02-20T02:16:53.883+00:00","modifiedAt":"2026-06-17T10:26:27.197+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":7.1,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":7.1,"severity":"HIGH"}],"references":["https://github.com/isaacs/node-tar/commit/2cb1120bcefe28d7ecc719b41441ade59c52e384","https://github.com/isaacs/node-tar/commit/d18e4e1f846f4ddddc153b0f536a19c050e7499f","https://github.com/isaacs/node-tar/security/advisories/GHSA-83g3-92jg-28cx"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-26960","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-22"],"productCriteria":["cpe:2.3:a:isaacs:tar:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-02-20T02:16:53.883","lastModified":"2026-06-17T10:26:27.197"},"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-2026-26960","identifiers":["CVE-2026-26960"]},"retained":false,"historicalAffected":[]},{"revision":"09befcd7ce334098a4f4d9fa28cff126","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-83g3-92jg-28cx","aliases":["CVE-2026-26960"],"title":"Arbitrary File Read/Write via Hardlink Target Escape Through Symlink Chain in node-tar Extraction","description":"### Summary\n`tar.extract()` in Node `tar` allows an attacker-controlled archive to create a hardlink inside the extraction directory that points to a file outside the extraction root, using default options.\n\nThis enables **arbitrary file read and write** as the extracting user (no root, no chmod, no `preservePaths`).\n\nSeverity is high because the primitive bypasses path protections and turns archive extraction into a direct filesystem access primitive.\n\n### Details\nThe bypass chain uses two symlinks plus one hardlink:\n\n1. `a/b/c/up -> ../..`\n2. `a/b/escape -> c/up/../..`\n3. `exfil` (hardlink) -> `a/b/escape/<target-relative-to-parent-of-extract>`\n\nWhy this works:\n\n- Linkpath checks are string-based and do not resolve symlinks on disk for hardlink target safety.\n  - See `STRIPABSOLUTEPATH` logic in:\n    - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/unpack.js:255`\n    - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/unpack.js:268`\n    - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/unpack.js:281`\n\n- Hardlink extraction resolves target as `path.resolve(cwd, entry.linkpath)` and then calls `fs.link(target, destination)`.\n  - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/unpack.js:566`\n  - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/unpack.js:567`\n  - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/unpack.js:703`\n\n- Parent directory safety checks (`mkdir` + symlink detection) are applied to the destination path of the extracted entry, not to the resolved hardlink target path.\n  - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/unpack.js:617`\n  - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/unpack.js:619`\n  - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/mkdir.js:27`\n  - `../tar-audit-setuid - CVE/node_modules/tar/dist/commonjs/mkdir.js:101`\n\nAs a result, `exfil` is created inside extraction root but linked to an external file. The PoC confirms shared inode and successful read+write via `exfil`.\n\n### PoC\n[hardlink.js](https://github.com/user-attachments/files/25240082/hardlink.js)\nEnvironment used for validation:\n\n- Node: `v25.4.0`\n- tar: `7.5.7`\n- OS: macOS Darwin 25.2.0\n- Extract options: defaults (`tar.extract({ file, cwd })`)\n\nSteps:\n\n1. Prepare/locate a `tar` module. If `require('tar')` is not available locally, set `TAR_MODULE` to an absolute path to a tar package directory.\n\n2. Run:\n\n```bash\nTAR_MODULE=\"$(cd '../tar-audit-setuid - CVE/node_modules/tar' && pwd)\" node hardlink.js\n```\n\n3. Expected vulnerable output (key lines):\n\n```text\nsame_inode=true\nread_ok=true\nwrite_ok=true\nresult=VULNERABLE\n```\n\nInterpretation:\n\n- `same_inode=true`: extracted `exfil` and external secret are the same file object.\n- `read_ok=true`: reading `exfil` leaks external content.\n- `write_ok=true`: writing `exfil` modifies external file.\n\n### Impact\nVulnerability type:\n\n- Arbitrary file read/write via archive extraction path confusion and link resolution.\n\nWho is impacted:\n\n- Any application/service that extracts attacker-controlled tar archives with Node `tar` defaults.\n- Impact scope is the privileges of the extracting process user.\n\nPotential outcomes:\n\n- Read sensitive files reachable by the process user.\n- Overwrite writable files outside extraction root.\n- Escalate impact depending on deployment context (keys, configs, scripts, app data).","state":0,"publishedAt":"2026-02-18T00:57:13+00:00","modifiedAt":"2026-09-10T03:50:34.4184933+00:00","affected":[{"ecosystem":"npm","name":"tar","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"7.5.8"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/isaacs/node-tar/security/advisories/GHSA-83g3-92jg-28cx","https://nvd.nist.gov/vuln/detail/CVE-2026-26960","https://github.com/isaacs/node-tar/commit/2cb1120bcefe28d7ecc719b41441ade59c52e384","https://github.com/isaacs/node-tar/commit/d18e4e1f846f4ddddc153b0f536a19c050e7499f","https://github.com/isaacs/node-tar"],"sourceUrl":"https://github.com/advisories/GHSA-83g3-92jg-28cx","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-83g3-92jg-28cx","identifiers":["GHSA-83g3-92jg-28cx","CVE-2026-26960"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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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-f981543109394c8f9b3df5737aa835e7","complete":false,"records":13821,"lastAttemptAt":"2026-11-15T11:15:00.6236179+00:00","lastSuccessAt":"2026-11-15T11:15:00.619+00:00","error":"257 identifier lookups failed; latest failures include AccessDenied (HTTP 403). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-15T11:15:00.619+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13558,"expectedIdentifiers":13874,"failedIdentifiers":257},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-15T11:05:17.2943378+00:00","complete":true,"records":1125,"lastAttemptAt":"2026-11-15T11:05:17.2943378+00:00","lastSuccessAt":"2026-11-15T11:05:17.4693563+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:05:17.4693566+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. 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