PT-2026-53085 · Undefined · Undefined

Published 2026-06-28 · Updated 2026-06-28 · CVE-2026-58053

NVD

CVSS v3.1

9.9

Critical

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.

Exploit

Fix

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

CVE-2026-58053

Affected Products

Undefined

References · 3

• 🔥 https://github.com/bikini/exploitarium/tree/main/gitea-act-runner-container-options-poc · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-58053 · Security Note
• https://vulncheck.com/advisories/gitea-act-runner-container-hardening-bypass-via-workflow-container-options · Note