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CVE-2026-18500 is an authentication and authorization flaw in the @fastify/jwt JSON Web Token plugin for Fastify affecting versions prior to 10.2.2. When an application calls request.jwtVerify({ key }) to enforce verification with a route-specific or domain-specific key, the explicitly supplied per-request verification key can be silently overridden by the plugin’s globally configured secret because the option-merging logic applies the global key last. As a result, routes intended to validate tokens against a distinct verification key may instead accept tokens signed with the global secret. This breaks key separation between authorization domains, such as user and admin token realms, and can allow a token valid for one trust domain to be accepted in another.
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No public exploit code observed for this vulnerability.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.