CVE-2021-39908 Code injection in GitLab

What is CVE-2021-39908?

CVE-2021-39908 is a medium-severity code injection vulnerability in Gitlab Gitlab, published on 1 Apr 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-94

Which versions are affected by CVE-2021-39908?

1 open source package ship an affected version, including gitlab. It affects 1 product.

Products include Gitlab Gitlab.

How do I fix CVE-2021-39908?

Upgrade gitlab to a fixed version for your release line: 14.2.6, 14.3.4 or 14.4.1.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-39908 being exploited?

There is no known exploitation of CVE-2021-39908 in the wild and no public exploit code.

Other vulnerabilities in Gitlab Gitlab

• CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound Exploited Critical 10.0
• CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal Exploited Critical 10.0
• CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control Exploited Critical 10.0
• CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution Exploited Critical 10.0
• CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Exploited Medium 6.8

All Gitlab Gitlab vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-gitlab-2021-39908, GHSA-hm25-53gr-mc5r, UBUNTU-CVE-2021-39908.