CVE-2026-89078

Double Free in GitLab

State: Published
Severity: 9.9 Critical
Published: Sep 23, 2026
Updated: Oct 30, 2026
Reserved: Sep 10, 2026

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.2 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary code on the GitLab server due to a double free issue when parsing a specially crafted regular expression in a CI/CD configuration.

Scores

CVSS	Score	Vector	Source
3.1	9.9 Critical	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L	GitLab

Weaknesses

CWE-415 Double Free

Affected Products

Product	Versions
GitLabGitLab	19.2 to before 19.2.7Affected 19.3 to before 19.3.3Affected 19.4 to before 19.4.1Affected

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/628577
HackerOne Bug Bounty Report #4019059technical-descriptionexploitpermissions-required
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/
https://www.ruby-lang.org/en/news/2026/10/23/regexp-fixes-for-gitlab-cves/

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