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CVE-2026-27780 — Vulnerability in code.gitea.io/gitea — CVE Details

CRITICAL

Gitea pre-receive hook scanner errors allow branch-protection bypass

Published July 3, 2026Updated September 10, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published July 3, 2026 (101 days ago).
  • Last revised September 10, 2026 — 69 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update code.gitea.io/gitea to 1.26.0 or later
go get code.gitea.io/gitea@v1.26.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
code.gitea.io/gitea
go
All versions1.26.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-863
    Incorrect AuthorizationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-27780?
Gitea pre-receive hook scanner errors allow branch-protection bypass This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-27780?
CVE-2026-27780 affects code.gitea.io/gitea. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-27780 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-vhq7-fwwh-7hjf
GO-2026-6346

Related CVEs

  • CVE-2026-26232
    CRITICAL

    Gitea OAuth2 authorization codes can be reused after expiry

  • CVE-2026-22547
    CRITICAL

    Gitea repository creation accepts insufficiently validated fields

  • CVE-2026-27775
    HIGH

    Gitea: Cached Per-Branch Permission Check in Pre-Receive Hook Allows Full Repository Write

  • CVE-2026-56654
    HIGH

    Gitea: Privilege Escalation via Access Token Scope Escalation in API

  • CVE-2026-58424
    HIGH

    Gitea: Permanent Fork PR Workflow Approval Gate Bypass

  • CVE-2026-57894
    HIGH

    Gitea: Repository Migration Follows Git HTTP Redirects After URL Allow/Block Validation, Enabling Internal Git Repository Exfiltration

  • CVE-2026-27771
    HIGH

    Gitea has insufficient permission checks for Composer package source links

  • CVE-2026-28737
    HIGH

    Gitea: Stored XSS via glTF `extensionsRequired` in Gitea 3D File Viewer

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