CVE-2026-117549
MediumCVSS 4.2Summary
@fastify/secure-session versions 7.5.0 through 8.4.1, when configured with the signed cookie option, calls the cookie unsign routine but still passes the original cookie value to the session decoder when the signature check reports it invalid, so a session with an invalid signature is decrypted anyway. This matters when an application uses a signing secret separate from the encryption key and rotates only the signing secret to retire sessions while keeping the encryption key active.
Risk Assessment
A holder of an old session cookie can strip the obsolete signature and keep using the session, defeating expected session revocation. The attacker must already possess an unexpired encrypted session cookie and cannot forge session data or extend expiry.
Recommendation
Upgrade @fastify/secure-session to version 8.4.2 or later. As a workaround, rotate the session encryption key rather than relying solely on rotation of the cookie signing secret.
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Original NVD description (English source)
@fastify/secure-session is a session plugin for Fastify that stores an encrypted session in a cookie. In versions 7.5.0 through 8.4.1, when the plugin is configured with the signed cookie option, it calls the cookie unsign routine but, when the signature check reports the value as invalid, still passes the original cookie value to the session decoder, so a session whose signature did not validate is decrypted anyway. The practical effect appears when an application supplies the cookie signing secret independently of the session encryption key and rotates only the signing secret to retire existing sessions while keeping the encryption key active, because a holder of an old session cookie can strip the now obsolete signature and keep using the session. The attacker must already possess an unexpired encrypted session cookie and needs neither secret, and cannot forge session data, extend expiry, or survive rotation of the encryption key. The issue is fixed in @fastify/secure-session 8.4.2, which no longer decodes the session when the signed cookie option is set and the signature check fails, and users should upgrade to 8.4.2 or later. As a workaround, rotate the session encryption key rather than relying on rotation of the cookie signing secret alone.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS