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Fencer Intel
high 8.6

CVE-2026-44578 in the critical feed json

Next.js: Server-side request forgery in applications using WebSocket upgrades

published 6mo ago modified 14d ago also EUVD-2026-30080 , GHSA-c4j6-fc7j-m34r

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
35.5%
EPSS 35.5% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known, plus a Nuclei check

Summary

Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or cloud metadata endpoints. Vercel-hosted deployments are not affected. This vulnerability is fixed in 15.5.16 and 16.2.5.

Patch / fix

  • npm next 15.5.16, 16.2.5
  • Red Hat Red Hat Trusted Artifact Signer 1.3 1783958622
  • Red Hat Red Hat Trusted Artifact Signer 1.4 1783327185

Is CVE-2026-44578 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-44578 updated cvss 8.6

Next.js: Next.js: Server-Side Request Forgery via crafted WebSocket upgrade requests

  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/disk-image-cuda-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Trusted Artifact Signer 1.3 rhtas/rekor-search-ui-rhel9 1783958622
    fixed: vendor fix RHSA-2026:40974
  • Red Hat Trusted Artifact Signer 1.4 rhtas/rekor-search-ui-rhel9 1783327185
    fixed: vendor fix RHSA-2026:37272
  • Red Hat Streams for Apache Kafka 2.9.4
    fixed: vendor fix RHSA-2026:34608
  • Red Hat Streams for Apache Kafka 3.2.1
    fixed: vendor fix RHSA-2026:54435
  • Red Hat Enterprise Linux 7 firefox Red Hat Enterprise Linux 8 firefox, thunderbird Red Hat Enterprise Linux 9 firefox, firefox-x11, thunderbird Red Hat Enterprise Linux 10 firefox, thunderbird Red Hat Trusted Artifact Signer 1.3 rhtas/fulcio-rhel9 1783968972, rhtas/rekor-server-rhel9 1783969365, rhtas/trillian-redis-rhel9 1783411108, rhtas/trillian-database-rhel9 1783960127, rhtas/trillian-logserver-rhel9 1783968861, rhtas/trillian-logsigner-rhel9 1783968861, +3 more Red Hat Trusted Artifact Signer 1.4 rhtas/fulcio-rhel9 1783326847, rhtas/rekor-server-rhel9 1783332625, rhtas/trillian-redis-rhel9 1783329793, rhtas/trillian-database-rhel9 1783329793, rhtas/trillian-logserver-rhel9 1783329793, rhtas/trillian-logsigner-rhel9 1783329793, +3 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5mo ago

Exploit prediction

35.54% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA ADP 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
GitHub 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm next
>=13.4.13, <15.5.16
>=16.0.0, <16.2.5
15.5.16
16.2.5

Affected products

  • vercel next.js
  • Red Hat Streams for Apache Kafka 2.9.4
  • Red Hat Red Hat Trusted Artifact Signer 1.3
  • Red Hat Red Hat Trusted Artifact Signer 1.4
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat streams for Apache Kafka 3

Classification

Weakness
  • CWE-918 Server-Side Request Forgery
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of vercel/next.js published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.