GHSA-jqcg-44mw-7w3hPublished

proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet

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cve-program · CVE-2026-90711

Published

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.

Source published: 15 Sep 2026 06:19:46 UTC
Source modified: 15 Sep 2026 14:48:38 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

euvd · EUVD-2026-78300

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 15, 2026, 6:19:46 AM

dateUpdated: Sep 15, 2026, 2:48:38 PM

12 related source bulletins · separate from aliases

RHSA-2026:90321: Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.31.0 Release.

CVE-2023-54404 · CVE-2025-62718 · CVE-2026-8643 · CVE-2026-9496 · CVE-2026-12185 · CVE-2026-13697 · CVE-2026-14682 · CVE-2026-15076 · CVE-2026-16308 · CVE-2026-17106 · CVE-2026-18427 · CVE-2026-19203 · CVE-2026-19534 · CVE-2026-39820 · CVE-2026-41178 · CVE-2026-41707 · CVE-2026-42499 · CVE-2026-42502 · CVE-2026-45416 · CVE-2026-47884 · CVE-2026-47886 · CVE-2026-47888 · CVE-2026-47890 · CVE-2026-47892 · CVE-2026-50010 · CVE-2026-55831 · CVE-2026-55833 · CVE-2026-55851 · CVE-2026-56745 · CVE-2026-56746 · CVE-2026-56819 · CVE-2026-56852 · CVE-2026-56854 · CVE-2026-58062 · CVE-2026-59280 · CVE-2026-59282 · CVE-2026-59283 · CVE-2026-59296 · CVE-2026-59313 · CVE-2026-59323 · CVE-2026-59651 · CVE-2026-59887 · CVE-2026-59899 · CVE-2026-59901 · CVE-2026-62243 · CVE-2026-64607 · CVE-2026-67213 · CVE-2026-67312 · CVE-2026-67313 · CVE-2026-67314 · CVE-2026-67320 · CVE-2026-67321 · CVE-2026-68494 · CVE-2026-68497 · CVE-2026-69152 · CVE-2026-69192 · CVE-2026-71290 · CVE-2026-71324 · CVE-2026-71325 · CVE-2026-71327 · CVE-2026-73500 · CVE-2026-73508 · CVE-2026-74835 · CVE-2026-75838 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-76169 · CVE-2026-81521 · CVE-2026-82417 · CVE-2026-82562 · CVE-2026-84292 · CVE-2026-84375 · CVE-2026-84394 · CVE-2026-84428 · CVE-2026-84445 · CVE-2026-84469 · CVE-2026-84504 · CVE-2026-84961 · CVE-2026-85062 · CVE-2026-85124 · CVE-2026-85152 · CVE-2026-85595 · CVE-2026-85597 · CVE-2026-86063 · CVE-2026-87743 · CVE-2026-88004 · CVE-2026-88007 · CVE-2026-88008 · CVE-2026-88009 · CVE-2026-88011 · CVE-2026-88012 · CVE-2026-88031 · CVE-2026-88878 · CVE-2026-88879 · CVE-2026-90711 · CVE-2026-93749 · CVE-2026-100655 · CVE-2026-100656 · CVE-2026-100666 · CVE-2026-101916 · CVE-2026-102925 · CVE-2026-102930 · CVE-2026-103435 · CVE-2026-109618 · CVE-2026-109619

RHSA-2026:87004: Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update

CVE-2026-45820 · CVE-2026-87776 · CVE-2026-90711 · CVE-2026-90959 · CVE-2026-94416 · CVE-2026-102266 · CVE-2026-102267 · CVE-2026-102271 · CVE-2026-102272 · CVE-2026-102273

WID-SEC-W-2026-4111: Red Hat Ansible Automation Platform: Mehrere Schwachstellen

CVE-2026-102266 · CVE-2026-102267 · CVE-2026-102268 · CVE-2026-102271 · CVE-2026-102272 · CVE-2026-102273 · CVE-2026-102925 · CVE-2026-102930 · CVE-2026-102937 · CVE-2026-102938 · CVE-2026-103262 · CVE-2026-104851 · CVE-2026-11332 · CVE-2026-27459 · CVE-2026-45820 · CVE-2026-63374 · CVE-2026-87776 · CVE-2026-87817 · CVE-2026-90711 · CVE-2026-90959 · CVE-2026-92982 · CVE-2026-94416 · CVE-2026-97687 · CVE-2026-97689

RHSA-2026:92584: Red Hat Security Advisory: General availability of the satellite/iop-remediations-rhel9 container image

CVE-2026-9496 · CVE-2026-90711 · CVE-2026-97057 · CVE-2026-102276 · CVE-2026-102278

RHSA-2026:86957: Red Hat Security Advisory: Red Hat Developer Hub 1.10.6 Plugin Catalog GA plugins release.

CVE-2026-90711

RHSA-2026:92510: Red Hat Security Advisory: RHOAI 3.4.6 - Red Hat OpenShift AI

CVE-2023-54404 · CVE-2026-11822 · CVE-2026-11824 · CVE-2026-13717 · CVE-2026-16221 · CVE-2026-17106 · CVE-2026-18446 · CVE-2026-25681 · CVE-2026-26007 · CVE-2026-27136 · CVE-2026-33814 · CVE-2026-33818 · CVE-2026-39821 · CVE-2026-39834 · CVE-2026-41178 · CVE-2026-42502 · CVE-2026-45819 · CVE-2026-45820 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-57516 · CVE-2026-59951 · CVE-2026-63209 · CVE-2026-63374 · CVE-2026-65898 · CVE-2026-67312 · CVE-2026-67314 · CVE-2026-67320 · CVE-2026-67321 · CVE-2026-69097 · CVE-2026-69153 · CVE-2026-73086 · CVE-2026-73088 · CVE-2026-73089 · CVE-2026-73643 · CVE-2026-75838 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-76844 · CVE-2026-77301 · CVE-2026-78679 · CVE-2026-82397 · CVE-2026-83663 · CVE-2026-84375 · CVE-2026-84445 · CVE-2026-85393 · CVE-2026-85525 · CVE-2026-87018 · CVE-2026-90711 · CVE-2026-91990 · CVE-2026-92599 · CVE-2026-93690 · CVE-2026-93749 · CVE-2026-94637 · CVE-2026-96640 · CVE-2026-96643 · CVE-2026-96644 · CVE-2026-96778 · CVE-2026-96804 · CVE-2026-97687 · CVE-2026-97689 · CVE-2026-102267 · CVE-2026-102271 · CVE-2026-102272 · CVE-2026-102276 · CVE-2026-102278 · CVE-2026-102282 · CVE-2026-104150 · CVE-2026-104851 · CVE-2026-105922 · CVE-2026-106445 · CVE-2026-106446 · CVE-2026-109156 · CVE-2026-109383 · CVE-2026-109527 · CVE-2026-109829 · CVE-2026-109869 · CVE-2026-109956 · CVE-2026-110856 · CVE-2026-110857 · CVE-2026-110858 · CVE-2026-110859 · CVE-2026-111064 · CVE-2026-111066 · CVE-2026-111497 · CVE-2026-112390 · CVE-2026-112391 · CVE-2026-112392 · CVE-2026-112397 · CVE-2026-112399 · CVE-2026-112400 · CVE-2026-112402 · CVE-2026-112404 · CVE-2026-112405 · CVE-2026-112893 · CVE-2026-112894 · CVE-2026-112895 · CVE-2026-112896 · CVE-2026-112897 · CVE-2026-112940 · CVE-2026-114145

RHSA-2026:95222: Red Hat Security Advisory: Ansible automation portal Red Hat Enterprise Linux Images

CVE-2026-90711 · CVE-2026-101916

RHSA-2026:95360: Red Hat Security Advisory: Red Hat build of Cryostat security update

CVE-2026-33818 · CVE-2026-39834 · CVE-2026-46603 · CVE-2026-46604 · CVE-2026-49978 · CVE-2026-56858 · CVE-2026-56862 · CVE-2026-59879 · CVE-2026-78669 · CVE-2026-82417 · CVE-2026-83663 · CVE-2026-84445 · CVE-2026-88031 · CVE-2026-90711 · CVE-2026-91135 · CVE-2026-94637 · CVE-2026-102276 · CVE-2026-102278 · CVE-2026-106445 · CVE-2026-106446

RHSA-2026:92578: Red Hat Security Advisory: General availability of the satellite/iop-remediations-rhel9 container image

CVE-2026-9496 · CVE-2026-90711 · CVE-2026-97057 · CVE-2026-102276 · CVE-2026-102278

RHSA-2026:85846: Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.8.18 security and bug fix update

CVE-2026-33186 · CVE-2026-59879 · CVE-2026-69153 · CVE-2026-84445 · CVE-2026-87776 · CVE-2026-88031 · CVE-2026-90711 · CVE-2026-92599 · CVE-2026-93749

RHSA-2026:86675: Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update

CVE-2026-77037 · CVE-2026-77301 · CVE-2026-82333 · CVE-2026-90711 · CVE-2026-92955 · CVE-2026-93749 · CVE-2026-102282 · CVE-2026-102990 · CVE-2026-106501 · CVE-2026-106503

RHSA-2026:88198: Red Hat Security Advisory: Red Hat Developer Hub 1.10.6 release.

CVE-2026-84782 · CVE-2026-90711 · CVE-2026-93748 · CVE-2026-93749 · CVE-2026-101916

Source published: Sep 15, 2026, 6:19:46 AM (timezone not stated)
Source modified: Sep 15, 2026, 2:48:38 PM (timezone not stated)
Saved here: 11 Nov 2026 17:03:47 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

nvd · CVE-2026-90711

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-290 · CWE-348 · CWE-697

Original publisher date fields

published: 2026-09-15T07:16:33.683

lastModified: 2026-09-16T19:40:00.317

Source published: 15 Sep 2026 07:16:33 UTC
Source modified: 16 Sep 2026 19:40:00 UTC
Saved here: 25 Oct 2026 16:19:22 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary · 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

osv · GHSA-jqcg-44mw-7w3h

Published

### Impact `proxy-addr` determines which network hops are trusted proxies so that `X-Forwarded-For` can be believed. When an application configures a trust subnet as an IPv4-mapped IPv6 address with a short prefix, such as `::ffff:10.0.0.0/8` (the correct spelling is `::ffff:10.0.0.0/104`), the subnet compiles with all-zero leading bits and matches every IPv4 address instead of the block it names. The same happens for any IPv6 trust subnet with zero leading bits, such as `::/1`. Every unauthenticated client is then trusted as a proxy at hop 0, so `proxyaddr(req, trust)`, and therefore `req.ip` and `req.ips` in Express, returns whatever the client sends in `X-Forwarded-For`. This defeats IP-based access control, rate limiting, geolocation, and audit logging. The misconfiguration compiles without any error, and the same block written correctly behaves correctly, so the difference is not visible from the configuration. ### Patches Upgrade to `proxy-addr` 2.0.8. An IPv4 address now matches an IPv6 trust subnet only when that subnet is a genuine IPv4-mapped subnet whose prefix covers the mapped marker. ### Workarounds Write IPv4 trust subnets in plain IPv4 notation (for example `10.0.0.0/8`). If IPv4-mapped IPv6 notation is required, use the full form so the prefix covers the mapped marker (for example `::ffff:10.0.0.0/104` for the `10.0.0.0/8` block).

Source published: 5 Oct 2026 23:30:26 UTC
Source modified: 5 Oct 2026 23:45:07 UTC
Saved here: 24 Oct 2026 13:17:17 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Publisher rating · CRITICAL