EUVD-2026-10113Published

express-rate-limit is a basic rate-limiting middleware for Express. In versions starting from 8.0.0 and prior to versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0, the default keyGenerator in express-rate-limit applies IPv6 subnet masking (/56 by def…

Historical advisory saved 9 Nov 2026 07:15:10 UTC. The publisher may have updated it since then. Latest advisory.

euvd · EUVD-2026-10113

Published

express-rate-limit is a basic rate-limiting middleware for Express. In versions starting from 8.0.0 and prior to versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0, the default keyGenerator in express-rate-limit applies IPv6 subnet masking (/56 by default) to all addresses that net.isIPv6() returns true for. This includes IPv4-mapped IPv6 addresses (::ffff:x.x.x.x), which Node.js returns as request.ip on dual-stack servers. Because the first 80 bits of all IPv4-mapped addresses are zero, a /56 (or any /32 to /80) subnet mask produces the same network key (::/56) for every IPv4 client. This collapses all IPv4 traffic into a single rate-limit bucket: one client exhausting the limit causes HTTP 429 for all other IPv4 clients. This issue has been patched in versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0.

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: Mar 7, 2026, 5:19:08 AM

dateUpdated: Mar 9, 2026, 8:44:25 PM

4 related source bulletins · separate from aliases

RHSA-2026:6404: Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

CVE-2025-69223 · CVE-2025-69873 · CVE-2026-1615 · CVE-2026-25639 · CVE-2026-25990 · CVE-2026-26007 · CVE-2026-28498 · CVE-2026-28802 · CVE-2026-29074 · CVE-2026-30827 · CVE-2026-30922

RHSA-2026:6309: Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

CVE-2025-69223 · CVE-2025-69873 · CVE-2026-1615 · CVE-2026-25639 · CVE-2026-25990 · CVE-2026-26007 · CVE-2026-28498 · CVE-2026-28802 · CVE-2026-29074 · CVE-2026-30827 · CVE-2026-30922

RHSA-2026:21772: Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.28.0 Release.

CVE-2025-14813 · CVE-2025-68121 · CVE-2026-0636 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-1605 · CVE-2026-2229 · CVE-2026-2327 · CVE-2026-5588 · CVE-2026-26996 · CVE-2026-27904 · CVE-2026-29074 · CVE-2026-30827 · CVE-2026-31802 · CVE-2026-32141 · CVE-2026-32280 · CVE-2026-32282 · CVE-2026-32305 · CVE-2026-33252 · CVE-2026-33810 · CVE-2026-34742 · CVE-2026-35051 · CVE-2026-39858 · CVE-2026-40477 · CVE-2026-40478 · CVE-2026-40611 · CVE-2026-40895 · CVE-2026-40912 · CVE-2026-40972 · CVE-2026-40973 · CVE-2026-40975 · CVE-2026-41240 · CVE-2026-42033 · CVE-2026-42035 · CVE-2026-42039 · CVE-2026-42041 · CVE-2026-42043 · CVE-2026-42044

WID-SEC-W-2026-0935: Red Hat Ansible Automation Platform: Mehrere Schwachstellen

CVE-2025-69223 · CVE-2025-69873 · CVE-2026-25639 · CVE-2026-25990 · CVE-2026-29074 · CVE-2026-30827 · CVE-2026-30922 · CVE-2026-26007 · CVE-2026-1615 · CVE-2026-28498 · CVE-2026-28802

Source published: Mar 7, 2026, 5:19:08 AM (timezone not stated)
Source modified: Mar 9, 2026, 8:44:25 PM (timezone not stated)
Saved here: 9 Nov 2026 07:15:10 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 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H