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CVE-2026-58053: Gitea act_runner - Container Hardening Bypass via Workflow Container Options

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-28 · updated 2026-10-25
• Weakness: CWE-269

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.

Affected products

• Gitea act_runner: through 0.262.0

References

• https://github.com/bikini/exploitarium/tree/main/gitea-act-runner-container-options-poc
• https://www.vulncheck.com/advisories/gitea-act-runner-container-hardening-bypass-via-workflow-container-options

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