Gitea built-in SSH server authentication bypass through key case folding

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-103059
StatePUBLISHED
AssignerGitea
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 20:17:14 UTC
Updated2026-10-15 02:26:26 UTC
DescriptionWhen Gitea's built-in SSH server is enabled (`START_SSH_SERVER = true`), the presented public key was looked up with an SQL `LIKE` comparison of its encoded content, which is case-insensitive on some databases, including the default SQLite. An attacker who can construct a case variant of another user's registered RSA public key for which they can derive the private key could have that key matched to the victim's account and authenticate over SSH as that user. Keys are now looked up by fingerprint.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

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

EPSS: 0.001560000 probability, percentile 0.041830000 (date 2026-10-07)

Problem Types: CWE-305 | CWE-305 CWE-305 Authentication Bypass by Primary Weakness

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gitea Gitea All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gitea Gitea affected 1.27.3 semver Not specified

References

ReferenceSourceLinkTags
github.com/go-gitea/gitea/releases/tag/v28.0.0 88ee5874-cf24-4952-aea0-31affedb7ff2 github.com Release Notes
github.com/go-gitea/gitea/pull/39423 88ee5874-cf24-4952-aea0-31affedb7ff2 github.com Patch, Issue Tracking
github.com/go-gitea/gitea/security/advisories/GHSA-8pwg-hcgm-54cp 88ee5874-cf24-4952-aea0-31affedb7ff2 github.com Vendor Advisory
blog.gitea.com/release-of-28.0.0 88ee5874-cf24-4952-aea0-31affedb7ff2 blog.gitea.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: https://github.com/carlini (en)

CNA: https://github.com/TheFox0x7 (en)

CNA: https://github.com/wxiaoguang (en)

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