CVE-2026-58053
Gitea act_runner - Container Hardening Bypass via Workflow Container Options
- State
- Published
- Severity
- 9.4 Critical
- Published
- Jun 28, 2026
- Updated
- Jun 30, 2026
- Reserved
- Jun 28, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.4 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | VulnCheck |
| 3.1 | 9.9 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-269 Improper Privilege Management
Affected Products
| Product | Versions |
|---|---|
act_runnerGitea |
|
References
- Proof of Conceptexploitthird-party-advisory
- VulnCheck Advisory: Gitea act_runner - Container Hardening Bypass via Workflow Container Optionsthird-party-advisory
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