Summary
GitLab Community Edition and Enterprise Edition contain a integer overflow or wraparound vulnerability that could allow an unauthenticated user to execute arbitrary code on the GitLab server via a specially crafted regular expression in a CI/CD configuration, due to insufficient regular expression validation.
Remediation
CISA required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
References
- Advisoryhttps://www.ruby-lang.org/en/news/2026/10/23/regexp-fixes-for-gitlab-cves
- Advisoryhttps://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-2-released/
- Advisoryhttps://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- Advisoryhttps://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- Advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-97229
- Advisoryhttps://github.com/rapid7/metasploit-framework/pull/22017
- Advisoryhttps://www.ruby-lang.org/en/news/2026/10/23/regexp-fixes-for-gitlab-cves/
- Referencehttps://gitlab.com/gitlab-org/gitlab/-/work_items/630686
- Referencehttps://hackerone.com/reports/4055749
- Referencehttps://hackerone.com/reports/4058589
- Referencehttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-97229