Vulnerability · Published Oct 6, 2026 · Assigned by Gitea

CVE-2026-103059Gitea built-in SSH server authentication bypass through key case folding

Critical 9.1

In plain English

A critical-severity security flaw in Gitea from Gitea. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.4%top 66.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

When 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.

Affected products (as reported)

Vendor	Product	Versions
Gitea	Gitea	0 – through 1.27.3

Weakness: CWE-305 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

GitHub Security Advisory GHSA-8pwg-hcgm-54cp vendor-advisory
Fix: go-gitea/gitea pull request #39423 patch
Gitea 28.0.0 release announcement release-notes
go-gitea/gitea v28.0.0 release release-notes