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TI-2026-74028 Aliases CVE-2026-73802

Gitea Runner container options bypass host isolation

Priority MEDIUM 41CWE-269Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-269.

Summary

Gitea Runner before 3.0.0 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, so a workflow author who can run jobs on an affected Docker-backed runner can execute commands as root on the runner host, bypassing container isolation. The flaw is classified as CWE-269, Improper Privilege Management.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00545 45th percentileScored 2026-11-07
Fix Fixed Gitea Runner (Gitea): 3.0.0gitea.com/gitea/runner (Go): 1.0.9-0.20260731160927-34bfa1915022

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GiteaGitea Runnerbefore 3.0.03.0.0Patch availableCNA
—gitea.com/gitea/runner (Go)before 1.0.9-0.20260731160927-34bfa19150221.0.9-0.20260731160927-34bfa1915022Patch availableGHSA-x4q3-gcj3-m6cf
  • Gitea Runner VendorGitea Affected before 3.0.0 Fixed in 3.0.0 Patch available CNA
  • gitea.com/gitea/runner (Go) Vendor— Affected before 1.0.9-0.20260731160927-34bfa1915022 Fixed in 1.0.9-0.20260731160927-34bfa1915022 Patch available GHSA-x4q3-gcj3-m6cf

Remediation

Update Gitea Runner to version 3.0.0 or later. For the Go package gitea.com/gitea/runner, update to 1.0.9-0.20260731160927-34bfa1915022 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Gitea Runner (Gitea) Fixed in 3.0.0
  • Fix · GHSA-x4q3-gcj3-m6cf gitea.com/gitea/runner (Go) Fixed in 1.0.9-0.20260731160927-34bfa1915022 Advisory →

Timeline

  1. 2026-10-14 Threatist record created from CVE-2026-73802
  2. 2026-10-18 CVSS score added · CISA ADP
  3. 2026-10-18 CISA SSVC decision points changed
  4. 2026-10-19 Priority changed: LOW → MEDIUM

References

Advisory 1

Other 4

  • TI-2026-42785 Gitea before 1.27.1 allows remote code execution via the diffpatch API through Git hook installation. KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-42033 Improper authorization on OAuth sign-in callback silently re-enables administrator-disabled accounts CVSS 3.1CRITICAL 9.8
  • TI-2026-40842 Privilege Escalation via Access Token Scope Escalation in API CVSS 3.1CRITICAL 9.8
  • TI-2026-16922 Gitea Docker image trusts spoofable reverse-proxy headers by default CVSS 3.1CRITICAL 9.8
  • TI-2026-42043 Team-repository linking endpoint bypasses the RepoAdminChangeTeamAccess organization setting CVSS 3.1CRITICAL 9.1
  • TI-2026-40381 OIDC userinfo Endpoint Returns Identity Claims Without Enforcing API Token Scopes CVSS 3.1CRITICAL 9.1
See all 240 →

Sources

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