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Fencer Vulns
medium 5.4

CVE-2026-46342 json

Nuxt: `__nuxt_island` endpoint does not bind responses to request props, enabling shared-cache poisoning

published 2026-05-19 5 mo ago modified 2026-07-08 4 mo ago also GHSA-g8wj-3cr3-6w7v , EUVD-2026-36418

cvss
5.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 0%
public exploits
0
none known

Summary

Nuxt is an open-source web development framework for Vue.js. In Nuxt versions 3.1.0 to before 3.21.6 and 4.0.0-alpha.1 to before 4.4.6 and @nuxt/nitro-server versions 3.20.0 to before 3.21.6 and 4.0.0-alpha.1 to before 4.4.6, the /__nuxt_island/* endpoint accepts attacker-controlled props query/body parameters and renders any island component without verifying that the URL-resident hash (<Name>_<hashId>.json) was actually issued for those inputs by <NuxtIsland>. The hash is computed and embedded client-side but never validated server-side, so the same path can return materially different responses depending on the query. This issue has been patched in versions 3.21.6 and 4.4.6.

Patch / fix

  • npm nuxt 3.21.6, 4.4.6
  • npm @nuxt/nitro-server 3.21.6, 4.4.6
  • nuxt nuxt 3.21.6, 4.4.5
  • nuxt nuxt/nitro-server 3.21.6, 4.4.6

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.09% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
CNA 4.0 2.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm nuxt
>=3.1.0, <3.21.6
>=4.0.0-alpha.1, <4.4.6
3.21.6
4.4.6
npm @nuxt/nitro-server
>=3.20.0, <3.21.6
>=4.2.0, <4.4.6
3.21.6
4.4.6

Affected products

  • nuxt nuxt

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
  • CWE-349 Acceptance of Extraneous Untrusted Data With Trusted Data
  • CWE-444 Inconsistent Interpretation of HTTP Requests

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.