CVE-2026-63475
isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers
- Risk score
- 43/100
- CVSS
- 4.3 v3.1
- Exploit chance (30 days)
- 0.4%
- 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 persists server-supplied circular symref= capabilities through updateRemoteRefs, and GitRefManager.resolve() follows the resulting loose symbolic references without a default depth limit or cycle detecti…
- Affected
- See advisory
- Fix
- Upgrade the product to 1.38.6 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 4.3 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-96wc-2m84-2cj7
Original description
isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers. Prior to 1.38.6, isomorphic-git persists server-supplied circular symref= capabilities through updateRemoteRefs, and GitRefManager.resolve() follows the resulting loose symbolic references without a default depth limit or cycle detection. After a clone from a malicious or man-in-the-middle-controlled remote, operations such as log, status, checkout, and branch that resolve refs/remotes/origin/a or refs/remotes/origin/b do not terminate. The circular references remain on disk, leaving the repository unusable for the application and causing a persistent denial of service. This issue is fixed in version 1.38.6.
Last activity 3 Nov 2026. Patch Forecast updates every hour.