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CVE-2026-45670: Nuxt is an open-source web development framework for Vue.js

27
Routine
MEDIUM 5.4UPGRADEUPGRADE

CVE-2026-45670 is a medium-severity flaw (CVSS 5.4) affecting nuxt\/rspack-builder, nuxt\/webpack-builder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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. Thi

Why this priority

  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score5.4 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance0.2% (top 90%)
CISA exploited listNo
WeaknessCWE-749
Published2026-06-12
Last modified2026-06-17
Publisher (CNA): GitHub, Inc. · Vendor: nuxt

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

nuxt nuxt\/rspack-builder UPGRADE
Affected: >= 3.12.2 and < 3.21.5 · >= 4.0.0 and < 4.4.5
Fixed in: 3.21.5, 4.4.5
Safe to downgrade to: a release before 3.12.2
1. Check installed version
npm ls nuxtrspack-builder
2. UPGRADE to 3.21.5
npm install nuxtrspack-builder@">=3.21.5"
3. If no update is available yet, DOWNGRADE to a release before 3.12.2
npm view nuxtrspack-builder versions npm install nuxtrspack-builder@"<3.12.2"
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
nuxt nuxt\/webpack-builder UPGRADE
Affected: >= 3.0.0 and < 3.21.5 · >= 4.0.0 and < 4.4.5
Fixed in: 3.21.5, 4.4.5
Safe to downgrade to: a release before 3.0.0
1. Check installed version
npm ls nuxtwebpack-builder
2. UPGRADE to 3.21.5
npm install nuxtwebpack-builder@">=3.21.5"
3. If no update is available yet, DOWNGRADE to a release before 3.0.0
npm view nuxtwebpack-builder versions npm install nuxtwebpack-builder@"<3.0.0"
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-45670?

nuxt\/rspack-builder: upgrade to 3.21.5, 4.4.5; nuxt\/webpack-builder: upgrade to 3.21.5, 4.4.5. Exact commands for each OS are on this page.

Is CVE-2026-45670 being exploited?

CVE-2026-45670 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-45670 affect?

CVE-2026-45670 affects nuxt\/rspack-builder, nuxt\/webpack-builder. Severity is medium (CVSS 5.4). 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 c

How urgent is CVE-2026-45670?

Priority 27/100. Public exploit reference

Software pages

Vue.js vulnerabilities · Webpack vulnerabilities

Related CVEs

References

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