CVE-2026-63478
Dashboard / Vulnerabilities / CVE-2026-63478
Summary: isomorphic-git: Path traversal via a ".." tree-entry name writes files outside the working directory on clone/checkout
Details: 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.
References: https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.38.6, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63478.json, https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-cw2g-2vwq-88w6, https://nvd.nist.gov/vuln/detail/CVE-2026-63478, https://github.com/isomorphic-git/isomorphic-git/commit/823843d1cd19182df79bc907c767f5bcecb39a0b, https://github.com/isomorphic-git/isomorphic-git/pull/2370
Affected packages
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