What is CVE-2026-45339?

Upgrade Ruby to version 4.0.9, 3.4.12, or 3.3.13 respectively. GitLab has patched its platforms; self-hosted users should update Ruby via their operating system package manager or Ruby version manager.

Is CVE-2026-45339 known to be exploited?

It is not marked known-exploited in this record.

How should CVE-2026-45339 be mitigated?

Upgrade Ruby to version 4.0.9, 3.4.12, or 3.3.13 respectively. GitLab has patched its platforms; self-hosted users should update Ruby via their operating system package manager or Ruby version manager.

CVE-2026-45339

TThe Hacker NewsinCVE·Oct 24high

Ruby Patches Three Onigmo Bugs Behind Four Critical GitLab RCE Flaws

Ruby has released point releases 4.0.9, 3.4.12, and 3.3.13 to fix three vulnerabilities in the Onigmo regular expression engine. These bugs underpin four critical CVEs (CVE-2026-45338 through CVE-2026-45341) that GitLab patched over the past month. A specially crafted regular expression pattern could corrupt memory during compilation, potentially enabling remote code execution on GitLab instances. Users are advised to upgrade Ruby to the patched versions immediately.

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CVE-2026-45339

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Ruby Patches Three Onigmo Bugs Behind Four Critical GitLab RCE Flaws