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Fencer Vulns
high 8.8

CVE-2026-73802 json

Gitea Runner host isolation bypass through container options

published 2026-10-02 37 d ago modified 2026-10-18 21 d ago also GHSA-x4q3-gcj3-m6cf , GO-2026-6656 , EUVD-2026-101107

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

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.

Patch / fix

  • go gitea.com/gitea/runner 1.0.9-0.20260731160927-34bfa1915022
  • Gitea Gitea Runner 3.0.0

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
21 d ago

Exploit prediction

0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go gitea.com/gitea/runner
<1.0.9-0.20260731160927-34bfa1915022
1.0.9-0.20260731160927-34bfa1915022

Affected products

  • Gitea Gitea Runner

Classification

Weakness
  • CWE-269 Improper Privilege Management

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.