webpack-dev-server users' source code may be stolen when they access a malicious web site

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0060, the 48th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 4 Jun 2025. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-4v9v-hfq4-rm2v
• OSV: GHSA-4v9v-hfq4-rm2v
• github.com/webpack/webpack-dev-server/security/advisories/GHSA-4v9v-hfq4-rm2v
• nvd.nist.gov/vuln/detail/CVE-2025-30359
• github.com/webpack/webpack-dev-server/commit/5c9378bb01276357d7af208a0856ca2163db188e
• github.com/webpack/webpack-dev-server/commit/d2575ad8dfed9207ed810b5ea0ccf465115a2239
• github.com/webpack/webpack-dev-server

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.