Gitea Runner host isolation bypass through container options
CVSS score
9.9
EPSS probability
—
Risk score
1.0
Published
1 d ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
3
Source agreement
Tam uyum
Evidence confidence
%71
Short explanation
Gitea Runner passes workflow-controlled container options into Docker job container configuration while privileged mode is disabled. A workflow author able to run jobs on an affected runner can use these options to access host namespaces and execute commands as root on the runner host.
This vulnerability allows attackers to bypass container isolation boundaries and gain full execution privileges on the runner host in shared or single-tenant environments.
What should be done?
- Follow the vendor advisory to apply updates or patches
- Treat container options as untrusted input when privileged mode is disabled
- Strip or reject dangerous host configuration flags and namespace options
Chain of evidence and sources
Gitea Runner, ayrıcalıklı mod devre dışı olsa bile iş akışı kontrollü konteyner seçeneklerini Docker iş konteyneri yapılandırmasına aktarır.
Etkilenen koşucularda iş çalıştırabilen bir iş akışı yazarı, konak ad alanlarına erişebilir ve konak üzerinde root yetkileri ile komut yürütebilir.
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Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE: CWE-269
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 9.9 | CVSS 3.x | — | Vector not published | GitHub Advisory |
| 0.0 | CVSS 4.0 | — | Vector not published | GitHub Advisory |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-73802 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-73802 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
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