by Kastro
Paper/Archive/CVE-2026-103059

CVE-2026-103059

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

EPSS 0.4%CVSS 9.1
critical.is priorityof 100
34
CVSS 9.1 (ADP)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 33.2.332 × 206.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Gitea≤ 1.27.3–CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorygithub.com/go-gitea/gitea/security/advisories/GHSA-8pwg-hcgm-54cppatchgithub.com/go-gitea/gitea/pull/39423refblog.gitea.com/release-of-28.0.0refgithub.com/go-gitea/gitea/releases/tag/v28.0.0