Heap-based buffer overflow in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2026-105437
Published: November 12, 2026
Vulnerability identifier: #VU166069
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105437
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially execute arbitrary commands within GitLab's Gitaly environment.
The vulnerability exists due to a heap-based buffer overflow in Git bundled with GitLab when processing input under certain conditions. A remote attacker can supply specially crafted input to trigger out-of-bounds heap writes that may enable arbitrary command execution within GitLab's Gitaly environment.
Affected software
GitLab Enterprise Edition
Gitlab Community Edition
Gitlab Community Edition
How to mitigate CVE-2026-105437
Install security update from vendor's website.
GitLab Enterprise Edition - addressed in versions 19.3.8, 19.4.6, 19.5.4
Gitlab Community Edition - addressed in versions 19.3.8, 19.4.6, 19.5.4
Gitlab Community Edition - addressed in versions 19.3.8, 19.4.6, 19.5.4