Workflow Concurrency Issue in Gitea Software by Gitea
CVE-2026-103670

7.5HIGH

Key Information:

Vendor

Gitea

Status
Gitea
Vendor
CVE Published:
6 October 2026

What is CVE-2026-103670?

This vulnerability in Gitea arises when a new Gitea Actions run is initiated, causing older runs within the same workflow-level concurrency group to be cancelled. The flaw occurs without verifying if the new run requires approval. Consequently, a user with permission to create a pull request from a fork could inadvertently cancel trusted, ongoing runs, especially if 'cancel-in-progress' is enabled. This behavior can disrupt deployments on self-hosted runners, potentially leaving the system in a partially operational state.

Affected Version(s)

Gitea 0 <= 1.27.3

References

https://github.com/go-gitea/gitea/security/advisories/GHS...
vendor-advisory
https://github.com/go-gitea/gitea/pull/39399
patch
https://blog.gitea.com/release-of-28.0.0/
release-notes

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

https://github.com/Pedromdsn
https://github.com/bircni
https://github.com/silverwind
.