by Kastro
Paper/Archive/CVE-2026-58053

CVE-2026-58053

Gitea act_runner — Gitea act_runner - Container Hardening Bypass via Workflow Container Options

EPSS 0.4%public exploitCVSS 9.9
critical.is priorityof 100
47
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 38.4.384 × 207.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
act_runner≤ 0.262.0–CNA

Scores by source

VulnCheck (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
VulnCheck (CNA)9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/bikini/exploitarium/tree/main/gitea-act-runner-container-options-pocwriteupvulncheck.com/advisories/gitea-act-runner-container-hardening-bypass-via-workflow-container-options