How severe is CVE-2026-45670?

CVE-2026-45670 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-45670 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-45670?

CVE-2026-45670 primarily affects Nuxt Nuxt/rspack-builder. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-45670?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-45670 have an EU (EUVD) identifier?

Yes. CVE-2026-45670 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36419.

When was CVE-2026-45670 published?

CVE-2026-45670 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-45670

CVE-2026-45670 is a medium-severity vulnerability in Nuxt Nuxt/rspack-builder with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-749.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 5.9
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36419
Weakness: CWE-749
Affected product: Nuxt Nuxt/rspack-builder
Published: 2026-06-12
Last modified: 2026-06-17

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.

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.
How severe is CVE-2026-45670?: CVE-2026-45670 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-45670 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-45670?: CVE-2026-45670 primarily affects Nuxt Nuxt/rspack-builder. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-45670?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-45670 have an EU (EUVD) identifier?: Yes. CVE-2026-45670 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36419.
When was CVE-2026-45670 published?: CVE-2026-45670 was published on 2026-06-12 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:nuxt:nuxt\/rspack-builder:*:*:*:*:*:node.js:*:*
cpe:2.3:a:nuxt:nuxt\/webpack-builder:*:*:*:*:*:node.js:*:*

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