CVE-2026-3988

Inefficient Algorithmic Complexity in GitLab

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing.

Affected

GitLab

CVSS v3.1 GITLAB

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

EPSS

0.85% chance of exploitation in the next 30 days, 58th percentile

Published

2026-03-25

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3597342

Security advisories

• https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released

References

• CVE Record
• NVD entry