🛡️ CVE-2023-6736 — gitlab

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-1333 OSV

5.0

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Inefficient Regular Expression Complexity in GitLab

An issue has been discovered in GitLab EE affecting all versions starting from 11.3 before 16.7.6, all versions starting from 16.8 before 16.8.3, all versions starting from 16.9 before 16.9.1. It was possible for an attacker to cause a client-side denial of service using malicious crafted content in the CODEOWNERS file.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2023-6736 is classified as CWE-1333: Inefficient Regular Expression Complexity. A regular expression backtracks catastrophically on crafted input, consuming CPU out of proportion to input size.

Affected software

CVE-2023-6736 is recorded against 1 package.

gitlab

Timeline and source

Published on 6 March 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

gitlab.com (Web)
hackerone.com (Web)
nvd.nist.gov (Web)

CVE-2023-6736 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Ubuntu

Details

Severity MEDIUM

CVSS Score 5.0

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE CWE-1333

Public Exploit ✅ No

Source OSV

Published 2024-03-06

Updated 2026-08-20

Modified 2026-06-17

Fix URL N/A

Affected Packages

Software	From version	Fixed in
gitlab	—	—

References

WEB https://gitlab.com/gitlab-org/gitlab/-/issues/435036

WEB https://hackerone.com/reports/2269023

WEB https://nvd.nist.gov/vuln/detail/CVE-2023-6736

🔗 NVD 🔗 Mitre

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