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Vulnerability record · CVE-2026-58053 · published 28 June 2026

CVE-2026-58053: Improper privilege management vulnerability

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.

9.4 CVSS 4.0 Critical EPSS 0.44% · top 64.1% CWE-269 · Improper privilege management Deferred
9.4CVSS 4.0 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
30 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-58053), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.