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.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:87004 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):

    * automation-gateway: authorization bypass via workload identity token forgery (CVE-2026-94416)
    * automation-platform-ui: proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet     (CVE-2026-90711)
    * automation-platform-ui: compression: Denial of Service via memory leak on premature response close     (CVE-2026-87776)
    * automation-platform-ui: fflate: Denial of Service via crafted ZIP archives (CVE-2026-45820)
    * python3.12-pulpcore: file:// scheme allowlist bypass in content upload file_url field enables arbitrary     file read and Pulp Container registry signing key theft (CVE-2026-90959)
    * python3.12-pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267)
    * python3.12-pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)
    * python3.12-pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266)
    * python3.12-pyjwt: Authentication bypass via acceptance of DER public keys as HMAC secrets     (CVE-2026-102271)
    * python3.12-pyjwt: Token forgery via acceptance of public JWK containers as HMAC secrets     (CVE-2026-102273)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    For details about this release, refer to the release notes listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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
370142	RHEL 9 : Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update (Important) (RHSA-2026:87004)	Nessus	Red Hat Local Security Checks	Local	high
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

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Tenable Plugins

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critical