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    2 vulnerabilities by @fastify/jwt

    CVE-2026-18500 (GCVE-0-2026-18500)

    Vulnerability from nvd – Published: 2026-08-15 13:16 – Updated: 2026-08-15 13:16
    VLAI
    Title
    @fastify/jwt vulnerable to authorization bypass via global secret overriding the per-request key
    Summary
    @fastify/jwt is a JSON Web Token plugin for Fastify. In versions before 10.2.2, a per-request verification key passed to request.jwtVerify({ key }) is silently overridden by the plugin's globally configured secret, because the option merge applies the global key last. Applications that use different keys for different authorization domains, for example separate user and admin keys, therefore accept a token signed with the global key on a route that explicitly requires another key. This lets an ordinary authenticated user cross a key-based trust boundary without knowing either secret. The issue is fixed in @fastify/jwt 10.2.2, where an explicit per-call key takes precedence over the global secret. Users should upgrade to 10.2.2.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    CWE
    • CWE-347 - Improper Verification of Cryptographic Signature
    Assigner
    References
    Impacted products
    Vendor Product Version
    @fastify/jwt @fastify/jwt Affected: 0 , < 10.2.2 (semver)
    Unaffected: 10.2.2 (semver)
    		Create a notification for this product.
    Credits
    incogbyte mcollina UlisesGascon
    Show details on NVD website
    To clipboard 

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      ],
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    CVE-2026-18500 (GCVE-0-2026-18500)

    Vulnerability from cvelistv5 – Published: 2026-08-15 13:16 – Updated: 2026-08-15 13:16
    VLAI
    Title
    @fastify/jwt vulnerable to authorization bypass via global secret overriding the per-request key
    Summary
    @fastify/jwt is a JSON Web Token plugin for Fastify. In versions before 10.2.2, a per-request verification key passed to request.jwtVerify({ key }) is silently overridden by the plugin's globally configured secret, because the option merge applies the global key last. Applications that use different keys for different authorization domains, for example separate user and admin keys, therefore accept a token signed with the global key on a route that explicitly requires another key. This lets an ordinary authenticated user cross a key-based trust boundary without knowing either secret. The issue is fixed in @fastify/jwt 10.2.2, where an explicit per-call key takes precedence over the global secret. Users should upgrade to 10.2.2.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    CWE
    • CWE-347 - Improper Verification of Cryptographic Signature
    Assigner
    References
    Impacted products
    Vendor Product Version
    @fastify/jwt @fastify/jwt Affected: 0 , < 10.2.2 (semver)
    Unaffected: 10.2.2 (semver)
    		Create a notification for this product.
    Credits
    incogbyte mcollina UlisesGascon
    Show details on NVD website
    To clipboard 

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