CVE-2026-117549

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{"bugzilla": {"description": "@fastify/secure-session: @fastify/secure-session: Session revocation bypass via improper signature validation", "id": "2565021", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2565021"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.2", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-347", "details": ["@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.", "A flaw was found in @fastify/secure-session. When configured to use signed cookies, the component fails to reject cookies that fail signature validation, proceeding to decrypt and accept the session payload. A remote user holding an unexpired session cookie can exploit this issue to bypass session revocation and maintain unauthorized access when an application rotates only its signing secret."], "name": "CVE-2026-117549", "public_date": "2026-11-02T10:26:30Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-117549\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-117549\nhttps://cna.openjsf.org/security-advisories.html\nhttps://github.com/fastify/fastify-secure-session/security/advisories/GHSA-4cgq-x5f7-r8jv"], "statement": "This vulnerability is rated as Moderate impact because exploitation requires an attacker to already hold an unexpired session cookie and is restricted to architectures where session revocation depends solely on rotating the cookie signing secret. Unauthorized actors cannot forge session payloads or extend session lifetimes because cryptographic integrity checks on the payload itself remain enforced by the encryption key. In Red Hat environments, exposure is limited to deployments using distinct signing and encryption keys where partial secret rollover is practiced.", "threat_severity": "Moderate"}

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