Container Isolation Vulnerability in Gitea Runner by Gitea
CVE-2026-73802

8.8HIGH

Key Information:

Vendor

Gitea

Status
Gitea Runner
Vendor
CVE Published:
14 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-73802?

The Gitea Runner software has a significant vulnerability that allows workflow authors to manipulate container options for Docker jobs, even when running in a non-privileged mode. This flaw enables unauthorized access to host namespaces and the execution of commands with root privileges on the runner host, undermining the isolation that Docker containers are supposed to provide. Affected users must be aware of this issue as it poses serious risks to their systems and configurations.

Affected Version(s)

Gitea Runner 0 < 3.0.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

Gitea2shell-Sandbox-Escape-to-Host-RCE
Created by sn0x-sharma

References

https://github.com/go-gitea/gitea/security/advisories/GHS...
vendor-advisory
https://blog.gitea.com/release-of-runner-3.0.0/
release-notes
https://gitea.com/gitea/runner/releases/tag/v3.0.0
release-notes

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

https://github.com/sn0x-sharma
.