CVE-2026-45670: nuxt\/rspack-build — Exploit & Fix

Description

Nuxt is an open-source web development framework for Vue.js. In @nuxt/rspack-builder and @nuxt/webpack-builder versions 3.15.4 to before 3.21.6, and 4.0.0-alpha.1 to before 4.4.6, there is an incomplete fix for GHSA-4gf7-ff8x-hq99. Source code may be stolen during dev when using the webpack / rspack builder if the dev server is bound to a non-loopback address (e.g. nuxt dev --host) and the developer opens a malicious site on the same network. This issue has been patched in versions 3.21.6 and 4.4.6.

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CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-749 CWE-749

Affected Products

Vendor	Product	Versions
nuxt	nuxt\/rspack-builder	3.12.2 — 3.21.5
nuxt	nuxt\/rspack-builder	4.0.0 — 4.4.5
nuxt	nuxt\/webpack-builder	3.0.0 — 3.21.5
nuxt	nuxt\/webpack-builder	4.0.0 — 4.4.5

References

Advisories & Patches

https://github.com/nuxt/nuxt/security/advisories/GHSA-4gf7-ff8x-hq99 https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g https://github.com/nuxt/nuxt/security/advisories/GHSA-4gf7-ff8x-hq99 https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g

Exploits

https://github.com/nuxt/nuxt/security/advisories/GHSA-4gf7-ff8x-hq99 https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g https://github.com/nuxt/nuxt/security/advisories/GHSA-4gf7-ff8x-hq99 https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g

Other References

https://github.com/nuxt/nuxt/pull/35051

Frequently Asked Questions

What is CVE-2026-45670? +

Nuxt is an open-source web development framework for Vue.js. In @nuxt/rspack-builder and @nuxt/webpack-builder versions 3.15.4 to before 3.21.6, and 4.0.0-alpha.1 to before 4.4.6, there is an incomplete fix for GHSA-4gf7-ff8x-hq99. Source code may be stolen during dev when using the webpack / rspack builder if the dev server is bound to a non-loopback address (e.g. nuxt dev --host) and the developer opens a malicious site on the same network. This issue has been patched in versions 3.21.6 and 4.4.6. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-45670? +

CVE-2026-45670 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0021, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-45670? +

CVE-2026-45670 affects products from nuxt, specifically: nuxt\/rspack-builder, nuxt\/webpack-builder. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-45670? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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