CVE-2021-39908

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-04-01 · updated 2026-06-17
Weakness: CWE-94

Description

In all versions of GitLab CE/EE starting from 0.8.0 before 14.2.6, all versions starting from 14.3 before 14.3.4, and all versions starting from 14.4 before 14.4.1 certain Unicode characters can be abused to commit malicious code into projects without being noticed in merge request or source code viewer UI.

Affected products

GitLab: from 0.8.0 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-2021-39908.json
https://gitlab.com/gitlab-org/gitlab/-/issues/337193
https://hackerone.com/reports/1280077
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39908.json
https://gitlab.com/gitlab-org/gitlab/-/issues/337193
https://hackerone.com/reports/1280077

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