Uncontrolled Memory Allocation in isomorphic-git - CVE-2026-63476
Published: August 5, 2026
Vulnerability identifier: #VU141013
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63476
CWE-ID: CWE-789
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to memory allocation with excessive size value in src/utils/applyDelta.js when applying a delta object from a packfile during git clone or fetch operations. A remote attacker can send a specially crafted packfile response to cause a denial of service.
User interaction is required to initiate a clone or fetch operation against a malicious or man-in-the-middle server.
Affected software
isomorphic-git
How to mitigate CVE-2026-63476
Install security update from vendor's website.
isomorphic-git - update to 1.38.6