Vulnerability in @nuxt/webpack-builder (CVE-2026-49993)
Summary
Vulnerability in @nuxt/webpack-builder (CVE-2026-49993). Confidential information can be exposed externally. Exploitable via Origin. Mitigation: upgrade to 3.21.7 or later.
Original description
The description as published by the source.
Nuxt is an open-source web development framework for Vue.js. In @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, there is an incomplete fix for GHSA-6m52-m754-pw2g. Source code may still 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 3.21.7 and 4.4.7.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-49993 has been found in @nuxt/webpack-builder.
Attackers can target a specific entry point like Origin over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 5.7/10.
What to do: upgrade @nuxt/webpack-builder to 3.21.7 or later.
If unsure, ask your IT team or search "@nuxt/webpack-builder CVE-2026-49993" on the vendor's site.
CVE-2026-49993 (@nuxt/webpack-builder) — CWE-749 / CVSS v3 5.7
Attack vector: adjacent-network / unauthenticated
Attack surface: Origin / Referer / crossorigin / e351de94
Patched: 3.21.7 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-749) exists in @nuxt/webpack-builder. Attackers reach the vulnerable code path via Origin without authentication.
Check the vendor advisory for the affected versions of @nuxt/webpack-builder. Attack surface: Origin / Referer / crossorigin / e351de94.
Severity: Medium (CVSS 5.7/10). Confidential information can be exposed externally.
Update to 3.21.7.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@nuxt/webpack-builder' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r '@nuxt/webpack-builder' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@nuxt/webpack-builderを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @nuxt/webpack-builder to 3.21.7ステージング環境で 3.21.7 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- patch github.com
- patch github.com
- patch github.com
- web github.com