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Fencer Vulns
medium 5.3

CVE-2026-94543 json

Next.js: Cache poisoning of SSG and ISR pages in self-hosted Next.js applications

published 2026-09-30 39 d ago modified 2026-10-07 32 d ago also EUVD-2026-91670 , GHSA-4jqv-mc3x-m676

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

Next.js is a React framework for building full-stack web applications. From 15.0.0 until 15.5.27 and 16.3.8, self-hosted applications using the Pages Router with statically generated or Incremental Static Regeneration pages can key a response cache entry without sufficiently binding it to the source route. A request can replace one page's cache entry with content from a different route, causing the affected page to serve incorrect content to every visitor until revalidation. Applications deployed on Vercel are not affected. This issue is fixed in versions 15.5.27 and 16.3.8.

Patch / fix

  • npm next 15.5.27, 16.3.8
  • vercel next.js 15.5.27, 16.3.8

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-2026-94543 updated cvss 4.8

next: Next.js: Response cache poisoning via improper route binding

  • Red Hat Enterprise Linux 7 firefox, firefox 140.14.0-1.el10_0 Red Hat Enterprise Linux 8 firefox, thunderbird, firefox 140.14.0-1.el10_0, thunderbird 140.14.0-1.el10_2 Red Hat Enterprise Linux 9 firefox, firefox-x11, thunderbird, firefox 140.14.0-1.el10_0, thunderbird 140.14.0-1.el10_2 Red Hat Enterprise Linux 10 firefox 140.14.0-1.el10_0, thunderbird 140.14.0-1.el10_2 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: no fix available “Fix deferred”
  • Red Hat Trusted Artifact Signer rhtas/rekor-search-ui-rhel9
    affected: no fix planned “Out of support scope”

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
33 d ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA 4.0 6.3 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/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
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
npm next
>=15.0.0, <15.5.27
>=16.0.0, <16.3.8
15.5.27
16.3.8

Affected products

  • vercel next.js

Classification

Weakness
  • CWE-524 Use of Cache Containing Sensitive Information
Technology feeds

References

Sources

Fencer Vulns 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.