CVE-2025-12571: Allocation of Resources Without Limits or Throttling in GitLab

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-11-26 · updated 2026-10-18
Weakness: CWE-770

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.10 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that could have allowed an unauthenticated user to cause a Denial of Service condition by sending specifically crafted requests containing malicious JSON payloads.

Affected products

GitLab: from 17.10.0 before 18.4.5; from 18.5.0 before 18.5.3; 18.6.0 — fixed in 18.4.5, 18.5.3

How to fix

Upgrade to a fixed version: GitLab 18.4.5, 18.5.3. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/579168
https://hackerone.com/reports/3362239

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