Input validation error in Gitlab Community Edition and GitLab Enterprise Edition - CVE-2026-1458

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Main Vulnerability Database Vulnerabilities #VU122646

Input validation error in Gitlab Community Edition and GitLab Enterprise Edition - CVE-2026-1458

Published: February 11, 2026


Vulnerability identifier: #VU122646
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-1458
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in Markdown processor. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.


Affected software

Gitlab Community Edition
GitLab Enterprise Edition

How to mitigate CVE-2026-1458

Install updates from vendor's website.

Gitlab Community Edition - addressed in versions 18.6.6, 18.7.4, 18.8.4
GitLab Enterprise Edition - addressed in versions 18.6.6, 18.7.4, 18.8.4

External References

Related Security Bulletins