CVE-2026-117499
LowCVSS 3.7Summary
@fastify/session in all releases before 11.1.6, with the default rolling session behavior, allows a request that restored a session before a logout to save its own copy after another request completed the session destroy call, recreating the destroyed session identifier with its authenticated data. An attacker holding a victim's valid signed session cookie can replay it to restore the session after it was meant to be revoked, without cookie theft or signature forgery.
Risk Assessment
An attacker with a valid session cookie could restore a session after logout, potentially leading to unauthorized access to the victim's account.
Recommendation
Update @fastify/session to version 11.1.6 or later; custom session stores must implement the new conditional write.
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Original NVD description (English source)
@fastify/session is a session plugin for Fastify. In all releases before 11.1.6, with the default rolling session behavior, a request that restored a session before a logout could save its own copy after another request had completed the session destroy call, recreating the destroyed session identifier with its authenticated data. An attacker who already holds a victim's valid signed session cookie and keeps a request in flight across the logout can replay that cookie to restore the session after it was meant to be revoked, without any cookie theft or signature forgery. The issue is fixed in @fastify/session 11.1.6, which adds a per session generation marker and a conditional store write so a session restored before a logout or regeneration cannot recreate or overwrite the current entry, and users should upgrade to 11.1.6 or later. There is no workaround, and custom session stores must implement the new conditional write.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS