proxy-addr is a Node.js module that determines a request's client address behind trusted reverse proxies, and it backs Express req.ip and req.ips. In versions 1.1.0 through 2.0.7, 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. This is a fail-open regression introduced in version 1.1.0. The issue is fixed in proxy-addr 2.0.8, and users should upgrade to 2.0.8 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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - proxy-addr is a Node.js module that determines a request's client address behind trusted reverse proxies,
    and it backs Express req.ip and req.ips. In versions 1.1.0 through 2.0.7, 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. This is a fail-open regression
    introduced in version 1.1.0. The issue is fixed in proxy-addr 2.0.8, and users should upgrade to 2.0.8 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. (CVE-2026-90711)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - proxy-addr is a Node.js module that determines a request's client address behind trusted reverse proxies,     and it backs Express req.ip and req.ips. In versions 1.1.0 through 2.0.7, 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. This is a fail-open regression     introduced in version 1.1.0. The issue is fixed in proxy-addr 2.0.8, and users should upgrade to 2.0.8 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. (CVE-2026-90711)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
473537	Echo: proxy-addr: security update to 2.0.8	Tenable Cloud Security	Echo Local Security Checks	Local	critical
473537	Echo: proxy-addr: security update to 2.0.8	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	critical
473008	SCA: security update for proxy-addr (GHSA-jqcg-44mw-7w3h)	Tenable Cloud Security	SCA Checks	Local	critical
473008	SCA: security update for proxy-addr (GHSA-jqcg-44mw-7w3h)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical
345953	Linux Distros Unpatched Vulnerability : CVE-2026-90711	Nessus	Misc.	Local	critical

Detections

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CVE-2026-90711

critical

Tenable Plugins

critical

critical

critical

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critical