CVE-2024-2651: Inefficient Regular Expression Complexity in GitLab

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 33.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-14 · updated 2026-06-17
Weakness: CWE-1333

Description

An issue has been discovered in GitLab CE/EE affecting all versions before 16.9.7, all versions starting from 16.10 before 16.10.5, all versions starting from 16.11 before 16.11.2. It was possible for an attacker to cause a denial of service using maliciously crafted markdown content.

Affected products

GitLab: before 16.9.7; from 16.10.0 before 16.10.5; from 16.11.0 before 16.11.2 — fixed in 16.10.5, 16.11.2, 16.9.7

How to fix

Upgrade to a fixed version: GitLab 16.10.5, 16.11.2, 16.9.7. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/450830
https://hackerone.com/reports/2408619
https://gitlab.com/gitlab-org/gitlab/-/issues/450830
https://hackerone.com/reports/2408619

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