CVE-2025-13078: Improper Validation of Specified Quantity in Input in GitLab

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-25 · updated 2026-06-17
Weakness: CWE-1284

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.10 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to cause a denial of service due to excessive resource consumption when processing certain webhook configuration inputs.

Affected products

GitLab: from 16.10.0 before 18.8.7; from 18.9.0 before 18.9.3; 18.10.0 — fixed in 18.8.7, 18.9.3

How to fix

Upgrade to a fixed version: GitLab 18.8.7, 18.9.3. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/
https://gitlab.com/gitlab-org/gitlab/-/work_items/580488
https://hackerone.com/reports/3413704

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