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PatchSiren cyber security CVE debrief

CVE-2026-45670 nuxt CVE debrief

A vulnerability was found 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. This issue is an incomplete fix for GHSA-4gf7-ff8x-hq99. Source code may be stolen during development when using the webpack / rspack builder if the development server is bound to a non-loopback address (e.g., `nuxt dev --host`) and the developer opens a malicious site on the same network.

Vendor
nuxt
Product
Unknown
CVSS
MEDIUM 5.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-15
Advisory published
2026-06-12
Advisory updated
2026-06-15

Who should care

Developers using @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 should be aware of this vulnerability.

Technical summary

The vulnerability has a CVSS score of 5.9 and is classified as MEDIUM severity. It was published on 2026-06-12T14:16:31.443Z and modified on 2026-06-12T16:01:25.477Z.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update to versions 3.21.6 or 4.4.6 or later.

Evidence notes

The vulnerability was patched in versions 3.21.6 and 4.4.6.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45670 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45670

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45670 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45670

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.