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No exploitation reportedFix available

CVE-2026-64641

No exploitation reported by the sources we read.

  • Published2026-07-27
  • Fixed in16.2.11 · 15.5.21
  • WeaknessCWE-834

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-07-2718:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-64641?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-64641?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Next.js
BranchAffectedFixed in
16.x≥ 16.0.0, < 16.2.1116.2.11
15.5≥ 13.0.0, < 15.5.2115.5.21

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-64641 Red Hat Product Security1 product fixed · 13 known affected

    next: Next.js: Denial of Service via crafted requests to App Router with Server Actions

    quarkus-websockets-next-spi as a component of Red Hat Build of Keycloak · rhceph/rhceph-5-dashboard-rhel8 as a component of Red Hat Ceph Storage 5 · rhceph/rhceph-6-dashboard-rhel9 as a component of Red Hat Ceph Storage 6 · +10 more

  • RHSA-2026:54435 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Streams for Apache Kafka 3.2.1 release and security update

Full record on NVD

Fix

  1. Update Next.js to 16.2.11 · 15.5.21
  2. Vendor fix Red Hat Product Security RHSA-2026:54435 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. No fix available, says the vendor Red Hat Product Security CVE-2026-64641 · 2 productsFix deferred
  4. No fix available, says the vendor Red Hat Product Security CVE-2026-64641 · 5 productsAffected
  5. No fix planned, says the vendor Red Hat Product Security CVE-2026-64641 · 5 productsOut of support scope
  6. No fix planned, says the vendor Red Hat Product Security CVE-2026-64641 · 1 productWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2026-07-27
  • OpenCVESSVC decisionnone—
  • CNACVSS 4.08.2read 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-834read 2026-10-23
  • FIRST EPSSEPSS score0.9 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-07-27
Last Modified
2026-07-29
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-64641?

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.

Is CVE-2026-64641 actively exploited?

Active exploitation of CVE-2026-64641 has not been confirmed. Its EPSS score was 0.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-64641?

CVE-2026-64641 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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