CVE-2026-27780 | Gitea versions before 1.26.0 do not fail closed on bufio.Sca… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2026-27780
State: PUBLISHED
Assigner: Gitea
Reserved: 2026-03-03 03:25 UTC
Published: 2026-07-03 20:19 UTC
Last updated: 2026-07-06 15:20 UTC
Primary CWE: CWE-863
Incorrect Authorization
Vendor / Product: Gitea / Gitea Open Source Git Server
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Gitea	Gitea Open Source Git Server	—	0 < 1.26.0

Weakness (CWE)

CWE	Source	Description
CWE-863	cna	Incorrect Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (3)

GitHub Pull Request #36963 https://github.com/go-gitea/gitea/pull/36963
Gitea v1.26.0 Release https://github.com/go-gitea/gitea/releases/tag/v1.26.0
Gitea v1.26.0 Release Blog Post https://blog.gitea.com/release-of-1.26.0/