Gitea Pre-Receive Hook Input Validation Bypass

Publication date: 2026-07-03

Last updated on: 2026-07-03

Assigner: Gitea Limited

Description

Gitea versions before 1.26.0 do not fail closed on bufio.Scanner errors while processing pre-receive hook input, allowing oversized input to bypass branch-protection checks.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-03

Last Modified

2026-07-03

Generated

2026-07-04

AI Q&A

2026-07-04

EPSS Evaluated

N/A

NVD

CVE-2026-27780

Affected Vendors & Products

Vendor	Product	Version / Range
gitea	gitea	to 1.26.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Gitea versions before 1.26.0. It occurs because the software does not fail closed when encountering errors from bufio.Scanner while processing input for pre-receive hooks. As a result, oversized input can bypass branch-protection checks.

Impact Analysis

The vulnerability allows oversized input to bypass branch-protection checks, which could lead to unauthorized changes being accepted in protected branches. This undermines the integrity of the code repository and could result in security risks or unintended code modifications.

Hi! I’m here to help you understand CVE-2026-27780. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70