CVE-2026-109553
CVE-2026-109553 · Gitea SSH certificate principal impersonation of other users
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Gitea resolved the principals of an SSH certificate by searching the content of all stored public keys instead of only principal keys. When Gitea trusts a user certificate authority (`SSH_TRUSTED_USER_CA_KEYS`) and accepts arbitrary principals (`SSH_AUTHORIZED_PRINCIPALS_ALLOW=anything`), a user could register another user's public key line as their own principal, or a holder of a certificate signed by that authority could list it, and then authenticate as the owner of that key through the HTTP signature API and the built-in SSH server. Instances that do not trust a user certificate authority are not affected.
CVSS 7.5 · Hoch · EPSS 0,2%
- Veröffentlicht
- Aktualisiert
Betroffene Produkte und Versionen
gitea
- Softwareversionen
- ≥ 0, ≤ 28.1.0: Betroffen (semver)
Keine Korrektur veröffentlicht
Originalquellen
- https://github.com/go-gitea/gitea/security/advisories/GHSA-vcp6-2qc6-gvq3
- https://github.com/go-gitea/gitea/pull/39839
- https://github.com/go-gitea/gitea/pull/39847
- https://blog.gitea.com/release-of-28.2.0/
- https://github.com/go-gitea/gitea/releases/tag/v28.2.0
- https://nvd.nist.gov/vuln/detail/CVE-2026-109553