CVE-2023-3994

Inefficient Regular Expression Complexity in GitLab

An issue has been discovered in GitLab CE/EE affecting all versions starting from 9.3 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 ProjectReferenceFilter to the preview_markdown endpoint.

Affected

GitLab

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.96% chance of exploitation in the next 30 days, 61st percentile

Published

2023-08-02

Updated

2026-04-27

Proof-of-concept exploits (1)

• https://hackerone.com/reports/1963255

References

• CVE Record
• NVD entry