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PatchSiren cyber security CVE debrief

CVE-2026-49993 nuxt CVE debrief

CVE-2026-49993 is a MEDIUM severity vulnerability in @nuxt/rspack-builder and @nuxt/webpack-builder. An incomplete fix for GHSA-6m52-m754-pw2g allows source code to be stolen during development when the dev server is bound to a non-loopback address and a malicious site is opened 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 from versions 3.15.4 to before 3.21.7 and 4.0.0 to before 4.4.7 should be aware of this vulnerability.

Technical summary

The vulnerability is caused by an incomplete fix for GHSA-6m52-m754-pw2g. When the dev server is bound to a non-loopback address (e.g., nuxt dev --host) and a developer opens a malicious site on the same network, source code may still be stolen.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to versions 3.21.7 or 4.4.7 or later.
  • Bind the dev server to a loopback address.

Evidence notes

CVE-2026-49993 has a CVSS score of 5.9 and is classified as MEDIUM severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49993 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49993

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

  • CVE-2026-49993 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49993

    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.