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TI-2026-23656 Aliases CVE-2026-30827GHSA-46wh-pxpv-q5gq

Resource allocation without limits in express-rate-limit

Priority HIGH 72CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 2 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00516 44th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial express-rate-limit (express-rate-limit): 8.0.2, 8.1.1, 8.2.2express-rate-limit (npm): 8.2.2, 8.1.1, 8.0.2Red Hat: 3 advisoriesRed Hat: 2 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
express-rate-limitexpress-rate-limit8.0.0 to before 8.0.2; 8.1.0 to before 8.1.1; 8.2.0 to before 8.2.28.0.2, 8.1.1, 8.2.2Patch availableCNA
—express-rate-limit (npm)8.2.0 to before 8.2.28.2.2Patch availableGHSA-46wh-pxpv-q5gq
—express-rate-limit (npm)8.1.0 to before 8.1.18.1.1Patch availableGHSA-46wh-pxpv-q5gq
—express-rate-limit (npm)8.0.0 to before 8.0.28.0.2Patch availableGHSA-46wh-pxpv-q5gq
  • express-rate-limit Vendorexpress-rate-limit Affected 8.0.0 to before 8.0.2; 8.1.0 to before 8.1.1; 8.2.0 to before 8.2.2 Fixed in 8.0.2, 8.1.1, 8.2.2 Patch available CNA
  • express-rate-limit (npm) Vendor— Affected 8.2.0 to before 8.2.2 Fixed in 8.2.2 Patch available GHSA-46wh-pxpv-q5gq
  • express-rate-limit (npm) Vendor— Affected 8.1.0 to before 8.1.1 Fixed in 8.1.1 Patch available GHSA-46wh-pxpv-q5gq
  • express-rate-limit (npm) Vendor— Affected 8.0.0 to before 8.0.2 Fixed in 8.0.2 Patch available GHSA-46wh-pxpv-q5gq

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:express-rate-limit_project:express-rate-limit:*:*:*:*:*:*:*:*8.0.0 to before 8.0.2; 8.2.0 to before 8.2.2VulnerableExpress-rate-limit Project
cpe:2.3:a:express-rate-limit_project:express-rate-limit:8.1.0:*:*:*:*:*:*:*8.1.0VulnerableExpress-rate-limit Project
  • cpe:2.3:a:express-rate-limit_project:express-rate-limit:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.0.2; 8.2.0 to before 8.2.2 Vulnerable ·Express-rate-limit Project
  • cpe:2.3:a:express-rate-limit_project:express-rate-limit:8.1.0:*:*:*:*:*:*:* Versions 8.1.0 Vulnerable ·Express-rate-limit Project

Remediation

  • Fix · CNA express-rate-limit (express-rate-limit) Fixed in 8.0.2, 8.1.1, 8.2.2
  • Fix · GHSA-46wh-pxpv-q5gq express-rate-limit (npm) Fixed in 8.2.2 Advisory →
  • Fix · GHSA-46wh-pxpv-q5gq express-rate-limit (npm) Fixed in 8.1.1 Advisory →
  • Fix · GHSA-46wh-pxpv-q5gq express-rate-limit (npm) Fixed in 8.0.2 Advisory →

Red Hat 3 advisories

  • RHSA-2026:21772 Released 2026-05-28 · Red Hat rating Important
    Red Hat OpenShift Dev Spaces 3.28.0 Release.
    • Red Hat OpenShift Dev Spaces 3.28 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/dashboard-rhel9, registry.redhat.io/devspaces/openvsx-rhel9 +3
  • RHSA-2026:6404 Released 2026-04-01 · Red Hat rating Important
    Red Hat Ansible Automation Platform 2.6 Container Release Update
    • Red Hat Ansible Automation Platform 2.6 registry.redhat.io/ansible-automation-platform-26/gateway-rhel9, registry.redhat.io/ansible-automation-platform-26/hub-rhel9, registry.redhat.io/ansible-automation-platform-26/lightspeed-chatbot-rhel9 +2
  • RHSA-2026:6309 Released 2026-03-31 · Red Hat rating Important
    Red Hat Ansible Automation Platform 2.6 Container Release Update
    • Red Hat Ansible Automation Platform 2.6 registry.redhat.io/ansible-automation-platform-26/gateway-rhel9, registry.redhat.io/ansible-automation-platform-26/hub-rhel9, registry.redhat.io/ansible-automation-platform-26/lightspeed-chatbot-rhel9 +2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Developer Hub 1AffectedNo fix planned: Will not fix
Self-service automation portal 2AffectedNo fix yet
Red Hat Ansible Automation Platform 2.6Fixed RHSA-2026:6309
Red Hat OpenShift Dev Spaces 3.28Fixed RHSA-2026:21772
Not affected: 2 products
  • Red Hat Ansible Automation Platform 2.6
  • Red Hat OpenShift Dev Spaces 3.28

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-30827
  2. 2026-10-03 Alias added: GHSA-46wh-pxpv-q5gq
  3. 2026-10-27 Affected versions changed · Red Hat

References

Exploit 1

Patch 1

Advisory 1

Other 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences