What’s Vulnerable › Vulnerabilities

CVE-2023-3364: Inefficient Regular Expression Complexity in GitLab

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 44.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-02 · updated 2026-06-17
• Weakness: CWE-1333

Description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 8.14 before 16.0.8, all versions starting from 16.1 before 16.1.3, all versions starting from 16.2 before 16.2.2. A Regular Expression Denial of Service was possible via sending crafted payloads which use AutolinkFilter to the preview_markdown endpoint.

Affected products

• GitLab: from 8.14 before 16.0.8; from 16.1 before 16.1.3; from 16.2 before 16.2.2 — fixed in 16.0.8, 16.1.3, 16.2.2

How to fix

Upgrade to a fixed version: GitLab 16.0.8, 16.1.3, 16.2.2. Check the vendor advisory for mitigations.

References

• https://gitlab.com/gitlab-org/gitlab/-/issues/415995
• https://hackerone.com/reports/1959727
• https://gitlab.com/gitlab-org/gitlab/-/issues/415995
• https://hackerone.com/reports/1959727

Get alerted when CVE-2023-3364 or the next vulnerability affects your stack