Resource exhaustion in Gitea - CVE-2026-96580
Published: October 19, 2026
Vulnerability identifier: #VU156107
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-96580
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to exhaust server memory and cause a denial of service affecting all tenants.
The vulnerability exists due to uncontrolled resource consumption in Gitea Actions static strategy.matrix expansion when creating workflow runs for fork pull requests. A remote user can open a pull request containing a workflow with a large static matrix to trigger uncapped Cartesian-product expansion before workflow approval, exhausting memory and causing the server process to be killed.
Exploitation requires Actions to be enabled, which is the default; no runner is needed.
Affected software
Gitea
How to mitigate CVE-2026-96580
Install security update from vendor's website.
Gitea - update to 28.0.0