{"affected":[{"product":"isomorphic-git","source":"CNA: GitHub_M","vendor":"isomorphic-git","versions":[{"status":"affected","version":"< 1.38.6"}]}],"cveId":"CVE-2026-63478","cwes":["CWE-22"],"description":"isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers. Prior to 1.38.6, isomorphic-git's tree parser in src/models/GitTree.js accepts a standalone .. tree-entry name because it rejects only path separators. During clone or checkout from a malicious or man-in-the-middle-controlled non-GitHub remote, nested .. entries can escape the working-tree root and write files at attacker-selected parent paths on any host-backed fs provider. The arbitrary file write can overwrite startup or configuration files and lead to code execution. GitHub-hosted trees are not a direct source because GitHub rejects .. entries during repository integrity checks. This issue is fixed in version 1.38.6.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: GitHub_M","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N","version":"3.1"}],"modifiedAt":1793734792188,"publishedAt":1793734792188,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-cw2g-2vwq-88w6"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/isomorphic-git/isomorphic-git/pull/2370"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/isomorphic-git/isomorphic-git/commit/823843d1cd19182df79bc907c767f5bcecb39a0b"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.38.6"}],"remediation":[],"revision":"fefecef01055849e1936f9c0818d4dc9f588b59cb03edb5397dd58cbc61b7795","sources":[{"modifiedAt":1793734792188,"name":"CNA: GitHub_M","retrievedAt":1793736601543,"url":"https://www.cve.org/CVERecord?id=CVE-2026-63478"}],"ssvc":null,"status":"published","title":"isomorphic-git: Path traversal via a \"..\" tree-entry name writes files outside the working directory on clone/checkout","updatedAt":1793736601543}