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    2 vulnerabilities found for @fastify/proxy-addr by @fastify/proxy-addr

    CVE-2026-92395 (GCVE-0-2026-92395)

    Vulnerability from nvd – Published: 2026-09-16 14:35 – Updated: 2026-09-17 18:39
    VLAI
    Title
    @fastify/proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet
    Summary
    @fastify/proxy-addr is a Fastify plugin that determines a request's client address behind trusted reverse proxies, and it backs Fastify request.ip and request.ips. In versions 3.0.0 through 5.1.0, a trust subnet written in IPv4-mapped IPv6 notation with an IPv4-sized prefix, such as ::ffff:10.0.0.0/8 instead of the correct ::ffff:10.0.0.0/104, is accepted without error but trusts every IPv4 address on the internet rather than the block it names. Because the socket peer then becomes trusted at hop 0, any unauthenticated client can supply an arbitrary X-Forwarded-For header and control the address the application reads, which defeats IP-based access control, rate limiting, geolocation, and audit logging. The plugin inherited this defect from the upstream proxy-addr module (CVE-2026-90711). The issue is fixed in @fastify/proxy-addr 5.1.1, and users should upgrade to 5.1.1 or later. As a workaround, ensure any IPv4-mapped IPv6 trust subnet uses a prefix length of at least 97, or express the range in plain IPv4 notation.
    Severity
    9.1 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-17 18:38 UTC
    CWE
    • CWE-290 - Authentication Bypass by Spoofing
    • CWE-348 - Use of Less Trusted Source
    • CWE-697 - Incorrect Comparison
    Assigner
    References
    Impacted products
    Vendor Product Version
    @fastify/proxy-addr @fastify/proxy-addr Affected: 3.0.0 , < 5.1.1 (semver)
    Unaffected: 5.1.1 (semver)
    		Create a notification for this product.
    Credits
    kagebunsher UlisesGascon mcollina kustundag
    Show details on NVD website
    To clipboard 

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    CVE-2026-92395 (GCVE-0-2026-92395)

    Vulnerability from cvelistv5 – Published: 2026-09-16 14:35 – Updated: 2026-09-17 18:39
    VLAI
    Title
    @fastify/proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet
    Summary
    @fastify/proxy-addr is a Fastify plugin that determines a request's client address behind trusted reverse proxies, and it backs Fastify request.ip and request.ips. In versions 3.0.0 through 5.1.0, a trust subnet written in IPv4-mapped IPv6 notation with an IPv4-sized prefix, such as ::ffff:10.0.0.0/8 instead of the correct ::ffff:10.0.0.0/104, is accepted without error but trusts every IPv4 address on the internet rather than the block it names. Because the socket peer then becomes trusted at hop 0, any unauthenticated client can supply an arbitrary X-Forwarded-For header and control the address the application reads, which defeats IP-based access control, rate limiting, geolocation, and audit logging. The plugin inherited this defect from the upstream proxy-addr module (CVE-2026-90711). The issue is fixed in @fastify/proxy-addr 5.1.1, and users should upgrade to 5.1.1 or later. As a workaround, ensure any IPv4-mapped IPv6 trust subnet uses a prefix length of at least 97, or express the range in plain IPv4 notation.
    Severity
    9.1 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-17 18:38 UTC
    CWE
    • CWE-290 - Authentication Bypass by Spoofing
    • CWE-348 - Use of Less Trusted Source
    • CWE-697 - Incorrect Comparison
    Assigner
    References
    Impacted products
    Vendor Product Version
    @fastify/proxy-addr @fastify/proxy-addr Affected: 3.0.0 , < 5.1.1 (semver)
    Unaffected: 5.1.1 (semver)
    		Create a notification for this product.
    Credits
    kagebunsher UlisesGascon mcollina kustundag
    Show details on NVD website
    To clipboard 

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