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    2 vulnerabilities found for middie by fastify

    CVE-2026-22031 (GCVE-0-2026-22031)

    Vulnerability from nvd – Published: 2026-01-19 15:24 – Updated: 2026-01-20 14:45
    VLAI
    Title
    Fastify Middie Middleware Path Bypass
    Summary
    @fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin` instead of `/admin`). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endpoints without the middleware constraints. Version 9.1.0 fixes the issue.
    Severity
    8.4 (High)
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-177 - Improper Handling of URL Encoding (Hex Encoding)
    Assigner
    References
    Impacted products
    Vendor Product Version
    fastify middie Affected: < 9.1.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-22031 (GCVE-0-2026-22031)

    Vulnerability from cvelistv5 – Published: 2026-01-19 15:24 – Updated: 2026-01-20 14:45
    VLAI
    Title
    Fastify Middie Middleware Path Bypass
    Summary
    @fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin` instead of `/admin`). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endpoints without the middleware constraints. Version 9.1.0 fixes the issue.
    Severity
    8.4 (High)
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-177 - Improper Handling of URL Encoding (Hex Encoding)
    Assigner
    References
    Impacted products
    Vendor Product Version
    fastify middie Affected: < 9.1.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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