AIKIDO-2026-214510
gitlab-ce is vulnerable to Cache Poisoning
78
High Risk
This Affects:
gitlab-ceTL;DR
extract_raw_ref accepts a commit SHA that matches at a line boundary inside the requested id, not only at the start of the value. The raw-file cache then stores the response under that parsed ref and path. A later fetch can return attacker-chosen file content to a CI job, including one that holds protected variables. The fix requires the SHA to match at the start of the id.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and CI jobs fetch raw repository files.
Background info
gitlab-ce is vulnerable to Cache Poisoning in versions 13.1.0 - 19.2.7, 19.3.0 - 19.3.3 and 19.4.0 - 19.4.1.
How to fix this
Upgrade the gitlab-ce library to the patch version.
Links
docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-2-released/gitlab.com/gitlab-org/gitlab/-/work_items/604950hackerone.com/reports/3832707
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