CVE-2023-6502: Inefficient Regular Expression Complexity in GitLab

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-23 · updated 2026-06-17
Weakness: CWE-1333

Description

A Denial of Service (DoS) condition has been discovered in GitLab CE/EE affecting all versions before 16.10.6, version 16.11 before 16.11.3, and 17.0 before 17.0.1. It is possible for an attacker to cause a denial of service using a crafted wiki page.

Affected products

GitLab: before 16.10.6; from 16.11.0 before 16.11.3; 17.0.0 — fixed in 16.10.6, 16.11.3

How to fix

Upgrade to a fixed version: GitLab 16.10.6, 16.11.3. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/433534
https://hackerone.com/reports/2263638
https://gitlab.com/gitlab-org/gitlab/-/issues/433534
https://hackerone.com/reports/2263638

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