CVE-2021-39914

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-11-04 · updated 2026-06-17
Weakness: CWE-400

Description

A regular expression denial of service issue in GitLab versions 8.13 to 14.2.5, 14.3.0 to 14.3.3 and 14.4.0 could cause excessive usage of resources when a specially crafted username was used when provisioning a new user

Affected products

GitLab: from 8.13.0 before 14.2.6; from 14.3.0 before 14.3.4; 14.4.0 — fixed in 14.2.6, 14.3.4

How to fix

Upgrade to a fixed version: GitLab 14.2.6, 14.3.4. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39914.json
https://gitlab.com/gitlab-org/gitlab/-/issues/289948
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39914.json
https://gitlab.com/gitlab-org/gitlab/-/issues/289948

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