CVE-2026-3988

HIGH 7.5

Inefficient Algorithmic Complexity in GitLab

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-407
Vendor	gitlab
Product	gitlab
Ecosystems	DevTools
Industries	Technology
Published	Mar 25, 2026
Last Updated	Mar 25, 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

18.5 < 18.8.7 18.9 < 18.9.3 18.10 < 18.10.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/work_items/593140 hackerone.com: https://hackerone.com/reports/3597342 about.gitlab.com: https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/

Credits

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