CVE-2026-109553

CVE-2026-109553 · Gitea SSH certificate principal impersonation of other users

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

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 · Élevée · EPSS 0,2%

Publication

2026-10-18T18:51:31.037Z

Mise à jour

2026-10-19T20:19:06.039Z

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