2026-06-28

Container escape in Gitea act_runner (Docker backend, through act 0.262.0) lets an authenticated user with workflow-execution rights break out to the host as root even when privileged mode is disabled. The runner passes a workflow's container.options string straight into the Docker job container's HostConfig and only forces the Privileged flag off, leaving dangerous options like --pid=host, --cap-add, and --security-opt intact. Publicly available exploit code exists (reported by VulnCheck), though it is not listed in CISA KEV.