Vulnerability details

CVE-2026-3988

GitLab GitLab

Inefficient Algorithmic Complexity in GitLab

CVSS 3.1

7.5High

Official description

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.

CVSS scores

Score	Version	Source	Vector
7.5High	3.1	CVEProject cvelistV5 (CNA) (GitLab)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
GitLab	GitLab	18.10 ≤ v < 18.10.1	CVEProject cvelistV5 (CNA)
GitLab	GitLab	18.5 ≤ v < 18.8.7	CVEProject cvelistV5 (CNA)
GitLab	GitLab	18.9 ≤ v < 18.9.3	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-03-25
Last updated: 2026-03-25
State: Published
Assigner (CNA): GitLab

Exploit prediction (EPSS)

0.48%

Probability of exploitation in 30 days

42.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-407
Inefficient Algorithmic Complexity