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TI-2026-46202 Aliases CVE-2026-64641GHSA-m99w-x7hq-7vfj

Next.js: Denial of Service in App Router using Server Actions

Priority MEDIUM 43CWE-834Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 fixed, 9 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

Next.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router with at least one Server Action can lead to excessive CPU usage blocking processing of further requests in the same process. This issue has been fixed in versions 15.5.21 and 16.2.11.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00856 58th percentileScored 2026-11-07
Fix Partial next.js (vercel): 15.5.21, 16.2.11next (npm): 15.5.21, 16.2.11Red Hat: 1 advisoryRed Hat: 1 fixed, 9 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
vercelnext.js13.0.0 to before 15.5.21; 16.0.0 to before 16.2.1115.5.21, 16.2.11Patch availableCNA
—next (npm)13.0.0 to before 15.5.2115.5.21Patch availableGHSA-m99w-x7hq-7vfj
—next (npm)16.0.0 to before 16.2.1116.2.11Patch availableGHSA-m99w-x7hq-7vfj
  • next.js Vendorvercel Affected 13.0.0 to before 15.5.21; 16.0.0 to before 16.2.11 Fixed in 15.5.21, 16.2.11 Patch available CNA
  • next (npm) Vendor— Affected 13.0.0 to before 15.5.21 Fixed in 15.5.21 Patch available GHSA-m99w-x7hq-7vfj
  • next (npm) Vendor— Affected 16.0.0 to before 16.2.11 Fixed in 16.2.11 Patch available GHSA-m99w-x7hq-7vfj

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*13.0.0 to before 15.5.21; 16.0.0 to before 16.2.11Vulnerablevercel
  • cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* Versions 13.0.0 to before 15.5.21; 16.0.0 to before 16.2.11 Vulnerable ·vercel

Remediation

  • Fix · CNA next.js (vercel) Fixed in 15.5.21, 16.2.11
  • Fix · GHSA-m99w-x7hq-7vfj next (npm) Fixed in 15.5.21 Advisory →
  • Fix · GHSA-m99w-x7hq-7vfj next (npm) Fixed in 16.2.11 Advisory →

Red Hat 1 advisory

  • RHSA-2026:54435 Released 2026-08-12 · Red Hat rating Important
    Streams for Apache Kafka 3.2.1 release and security update
    • Streams for Apache Kafka 3.2.1

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Build of KeycloakAffectedNo fix yet
Red Hat Ceph Storage 5AffectedNo fix planned: Out of support scope
Red Hat Ceph Storage 6AffectedNo fix planned: Out of support scope
Red Hat Ceph Storage 7AffectedNo fix planned: Out of support scope
Red Hat Ceph Storage 8AffectedNo fix planned: Out of support scope
Red Hat Ceph Storage 9AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet
Red Hat JBoss Enterprise Application Platform 7AffectedNo fix yet: Fix deferred
Red Hat Single Sign-On 7AffectedNo fix yet: Fix deferred
Streams for Apache Kafka 3.2.1Fixed RHSA-2026:54435
Not affected: 18 products
  • Cryostat 4
  • Red Hat 3scale API Management Platform 2
  • Red Hat AMQ Broker 7
  • Red Hat Connectivity Link 1
  • Red Hat Data Grid 8
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat JBoss Enterprise Application Platform 8
  • Red Hat Openshift Data Foundation 4
  • Red Hat Trusted Artifact Signer
  • Red Hat build of Apache Camel - HawtIO 4
  • Red Hat build of Apache Camel 4 for Quarkus 3
  • Red Hat build of Apache Camel for Spring Boot 4
  • Red Hat build of Apicurio Registry 3
  • Red Hat build of Quarkus
  • streams for Apache Kafka 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64641
  2. 2026-10-03 Alias added: GHSA-m99w-x7hq-7vfj
  3. 2026-10-21 Affected versions changed · Red Hat
  4. 2026-11-03 Affected versions changed · Red Hat

References

Patch 2

Advisory 1

Other 3

  • TI-2025-34861 Deserialization of untrusted data in Meta react-server-dom-webpack KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-21309 Authorization Bypass in Next.js Middleware CVSS 3.1CRITICAL 9.1
  • TI-2025-34863 Deserialization of untrusted data in Meta react-server-dom-webpack CVSS 3.1HIGH 7.5
  • TI-2024-31371 Cache Poisoning in next.js CVSS 3.1HIGH 7.5
  • TI-2023-24914 Next.js before 13.4.20-canary.13 lacks a cache-control header and thus empty prefetch… CVSS 3.1HIGH 7.5
  • TI-2026-32490 Next.js: Server-side request forgery in applications using WebSocket upgrades CVSS 3.1HIGH 8.6
See all 62 →

Sources

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