CVE-2023-4912: Allocation of Resources Without Limits or Throttling in GitLab

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-01 · updated 2026-06-17
Weakness: CWE-770

Description

An issue has been discovered in GitLab EE affecting all versions starting from 10.5 before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. It was possible for an attacker to cause a client-side denial of service using malicious crafted mermaid diagram input.

Affected products

GitLab: from 10.5.0 before 16.4.3; from 16.5.0 before 16.5.3; 16.6.0 — fixed in 16.4.3, 16.5.3

How to fix

Upgrade to a fixed version: GitLab 16.4.3, 16.5.3. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/424882
https://hackerone.com/reports/2137421
https://gitlab.com/gitlab-org/gitlab/-/issues/424882
https://hackerone.com/reports/2137421

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