Vulnerability Description
Gitea act_runner with the Docker backend (through act 0.262.0) passes a workflow's container.options string to the Docker job container's HostConfig and, when configured with privileged: false, forces only the Privileged flag off while merging options such as --pid=host, --cap-add, and --security-opt unchanged. A user who can run a workflow on a Docker-backed runner can create a job container with host namespaces and broad capabilities and escape to the host as root despite privileged mode being disabled.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/bikini/exploitarium/tree/main/gitea-act-runner-container-opti
- https://www.vulncheck.com/advisories/gitea-act-runner-container-hardening-bypass
FAQ
What is CVE-2026-58053?
CVE-2026-58053 is a vulnerability with a CVSS score of 9.9 (CRITICAL). Gitea act_runner with the Docker backend (through act 0.262.0) passes a workflow's container.options string to the Docker job container's HostConfig and, when configured with privileged: false, forces...
How severe is CVE-2026-58053?
CVE-2026-58053 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-58053?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.