🔐 CVE Alert

CVE-2023-3994

HIGH 7.5

Inefficient Regular Expression Complexity in GitLab

CVSS Score
7.5
EPSS Score
0.4%
EPSS Percentile
58th

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.

CWE CWE-1333
Vendor gitlab
Product gitlab
Ecosystems
Industries
Technology
Published Aug 2, 2023
Last Updated Apr 27, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected Versions

GitLab / GitLab
9.3 < 16.0.8 16.1 < 16.1.3 16.2 < 16.2.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗
gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/issues/416225 hackerone.com: https://hackerone.com/reports/1963255

Credits

Thanks [ryhmnlfj](https://hackerone.com/ryhmnlfj) for reporting this vulnerability through our HackerOne bug bounty program