CVE-2026-63478 Details
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.
A path traversal vulnerability has been identified in isomorphic-git, a JavaScript implementation of Git for Node.js and browsers. This vulnerability exists in versions prior to 1.38.6, specifically within the tree parser of 'src/models/GitTree.js'. The parser fails to properly validate tree entry names, allowing standalone '..' entries to escape the working directory and write files to arbitrary parent paths. This issue can be exploited during 'clone' or 'checkout' operations from non-GitHub remotes, potentially overwriting configuration files and leading to code execution.
Users should update to isomorphic-git version 1.38.6 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 3, 2026CISA-ADP
Assessed Nov 7, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-cw2g-2vwq-88w6 | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/isomorphic-git/isomorphic-git/commit/823843d1cd19182df79bc907c767f5bcecb39a0b | [email protected] | Source CodeVendor |
| https://github.com/isomorphic-git/isomorphic-git/pull/2370 | [email protected] | Source CodeVendor |
| https://github.com/isomorphic-git/isomorphic-git/releases/tag/v1.38.6 | [email protected] | Release NotesVendor |
| https://github.com/isomorphic-git/isomorphic-git/security/advisories/GHSA-cw2g-2vwq-88w6 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| isomorphic-git | <= v1.38.5 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 7, 2026 | CVE Modified | CISA-ADP |
| Nov 3, 2026 | New CVE Received | [email protected] |