CVE-2026-73802

Gitea Runner host isolation bypass through container options

Published Oct 14, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
Gitea Runner passes workflow-controlled container options into Docker job container configuration while privileged mode is disabled. Host namespace settings, expanded capabilities, and security profile overrides can remain effective despite Privileged being forced false. A workflow author able to run jobs on an affected Docker-backed runner can use these options to access host namespaces and execute commands as root on the runner host, bypassing the intended container isolation.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-x4q3-gcj3-m6cf gitea-runner: workflow container.options passes host namespaces and capability flags to job container when privileged mode is disabled
History
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Gitea Runner passes workflow-controlled container options into Docker job container configuration while privileged mode is disabled. Host namespace settings, expanded capabilities, and security profile overrides can remain effective despite Privileged being forced false. A workflow author able to run jobs on an affected Docker-backed runner can use these options to access host namespaces and execute commands as root on the runner host, bypassing the intended container isolation.
Title Gitea Runner host isolation bypass through container options
Weaknesses CWE-269
References

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Weaknesses

Sources

Status
PUBLISHED
Assigner
Gitea
Published
Updated
Oct 18, 2026, 1:34 PM
Reserved
Aug 13, 2026, 4:50 PM
Status
Deferred
Published
Oct 14, 2026, 3:17 PM
Modified
Oct 18, 2026, 2:16 PM