GHSA-mx8g-39q3-5c79
webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies
En bref
- Publiée
- Mise à jour
- CVE
- CVE-2026-9595
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Description
### Impact When a user-configured proxy on `webpack-dev-server` has a broad context (e.g. `/`) and `ws: true`, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and `Origin` header to the backend, bypasses the dev server's Host/Origin validation, and corrupts the HMR socket (both HMR and the proxy end up writing to the same socket). ### Patches Fixed in `webpack-dev-server` 5.2.5. ### Workarounds Scope user-defined proxy `context` to specific paths instead of `/`, or omit `ws: true` from the proxy entry when WebSocket forwarding is not required.
Paquets affectés
| Paquet | Versions |
|---|---|
| npm · webpack-dev-server | introduced 0, fixed 5.2.5 |
Références
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-mx8g-39q3-5c79 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-9595 ADVISORY
- https://github.com/facebook/create-react-app/pull/7444 WEB
- https://github.com/webpack/webpack-dev-server/pull/4316 WEB
- https://github.com/vuejs/vue-cli/commit/72ba7505aff2a8314e82aa5082379a77504a1fcb WEB
- https://cna.openjsf.org/security-advisories.html WEB
- https://github.com/webpack/webpack-dev-server PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |