CVE-2026-63478
MEDIUM
MEDIUM
Priority: 0.02
BB Relevance:
51/100
Published: 2026-11-03
Modified: 2026-11-07
First seen: 2026-11-03
Status: active
Attack Surface
Network
No Auth
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
Required
S:
Unchanged
C:
None
I:
High
A:
None
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.
Weakness Classification (1)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| isomorphic-git | isomorphic-git | < 1.38.6 |
| isomorphic-git | isomorphic-git | < 1.38.6 |
References & Advisories (4)
x_refsource_MISC
x_refsource_MISC
x_refsource_MISC
x_refsource_CONFIRM