CVE-2026-63475mediumCWE-674CWE-835

CVE-2026-63475: medium-severity vulnerability in isomorphic-git

isomorphic-git: Circular symbolic references cause non-terminating resolution (DoS)

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 4.3epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Affected products
isomorphic-git · isomorphic-git
Related CVEs — isomorphic-git

In the same product, most dangerous first.

CVE-2026-63395HIGHisomorphic-git: Arbitrary file write outside the working tree via a directory symlink during checkout (potential RCE)EPSS 0.7%CVE-2026-89011HIGHisomorphic-git < 1.42.0 Prototype Pollution via getRemoteInfoEPSS 0.4%CVE-2026-63478MEDIUMisomorphic-git: Path traversal via a ".." tree-entry name writes files outside the working directory on clone/checkoutEPSS 0.3%CVE-2026-63476MEDIUMisomorphic-git: Unbounded memory allocation from attacker-controlled delta target size (DoS)EPSS 0.3%