Buffer Overflow Vulnerability in Gitea Branch Protection Mechanism
CVE-2026-27780

9.8CRITICAL

Key Information:

Vendor

Gitea

Status
Gitea Open Source Git Server
Vendor
CVE Published:
3 July 2026

What is CVE-2026-27780?

In Gitea versions before 1.26.0, a vulnerability exists that hampers the effectiveness of the branch protection mechanism. Specifically, the application does not properly handle errors resulting from bufio.Scanner while processing input for pre-receive hooks. This oversight allows oversized inputs to bypass established branch protection checks, potentially leading to unauthorized changes. Users are encouraged to upgrade to version 1.26.0 or later to mitigate this risk.

Affected Version(s)

Gitea Open Source Git Server 0 < 1.26.0

References

https://github.com/go-gitea/gitea/pull/36963
patch
https://github.com/go-gitea/gitea/releases/tag/v1.26.0
release-notes
https://blog.gitea.com/release-of-1.26.0/
release-notes

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

yonatan-pl
.