CVE-2026-63478
isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers
- Risk score
- 42/100
- CVSS
- 5.3 v3.1
- Published
- 3 Nov 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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-GitHu…
- Affected
- See advisory
- Fix
- Upgrade the product to 1.38.6 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 5.3 medium
- On your watchlist: node.js
References
- https://github.com/isomorphic-git/isomorphic-git/commit/823843d1cd19182df79bc907c767f5bcecb39a0b
- https://github.com/isomorphic-git/isomorphic-git/pull/2370
- https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.38.6
- https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-cw2g-2vwq-88w6
Original 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.
Last activity 3 Nov 2026. Patch Forecast updates every hour.