CVE-2026-97229 is an integer overflow in Onigmo, the regex engine built into Ruby, which GitLab uses to compile CI/CD config regexes. A crafted regex can run code on the server without authentication. GitLab scored it 10.0 and says it works "under certain conditions", without saying which.

Fixed in GitLab 19.2.8, 19.3.5 and 19.4.2, released Oct 12. Affected: self-managed CE/EE 19.2.0-19.2.7, 19.3.0-19.3.4, 19.4.0-19.4.1. GitLab.com and Dedicated are already patched.

CISA added it to KEV on Oct 29 with a due date of Nov 1. Rapid7 published a working PoC on Oct 13. Censys counted about 25,766 hosts on affected versions in mid-October.

The catch is in Alpine Linux's post-mortem from Oct 28. Alpine was attacked on Oct 20-21 after it had already upgraded GitLab, and the upgrade did not help. GitLab's patch fixes the Ruby bundled in its own omnibus and CNG packages. Alpine runs GitLab on a system Ruby, so the vulnerable engine was still there. Source installs and distro packages have the same problem.

Those installs need Ruby updated separately: 3.3.13 or 3.4.12 (released Oct 23), or 4.0.8 or later in the 4.0 series. Ruby issued no CVE of its own for this, so scanners report it under the GitLab number.

Check both the GitLab version and the Ruby version before calling an instance patched.

Sources: GitLab critical patch release 19.4.2 / 19.3.5 / 19.2.8 (Oct 12); CISA KEV entry for CVE-2026-97229 (added Oct 29, due Nov 1); Alpine Linux post-mortem (Oct 28); Rapid7 analysis and PoC (Oct 13); Ruby 3.3.13 / 3.4.12 release notes (Oct 23).

If you run self-managed GitLab CE/EE, patch now. A crafted CI/CD config lets someone run code on the server without logging in. It's being actively exploited, and CISA added it to KEV on 29 Oct. Fixed versions are 19.4.2, 19.3.5 and 19.2.8. GitLab.com is already patched. Check your version under Admin > Dashboard and upgrade to the fixed release for your branch.

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