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Vulnerability · Published Sep 23, 2026 · Assigned by GitLab

CVE-2026-89078Double Free in GitLab

Critical 9.9

In plain English

A critical-severity double free in GitLab from GitLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.9Critical
Exploit odds (30 days)0.5%top 55.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.21ruby3.3.13-r0ALPINE-CVE-2026-89078
Alpine:v3.22ruby3.4.12-r0ALPINE-CVE-2026-89078
Alpine:v3.23ruby3.4.12-r0ALPINE-CVE-2026-89078
Alpine:v3.24ruby3.4.12-r0ALPINE-CVE-2026-89078
Debian:12ruby3.1no fix listedDEBIAN-CVE-2026-89078
Debian:13ruby3.3no fix listedDEBIAN-CVE-2026-89078
Debian:14ruby3.3no fix listedDEBIAN-CVE-2026-89078

Affected products (as reported)

VendorProductVersions
GitLab GitLab 19.2 – before 19.2.719.3 – before 19.3.319.4 – before 19.4.1

Weakness: CWE-415 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

References