GHSA-mx8g-39q3-5c79

webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

Medium highest severity reported · also known as CVE-2026-9595

2
catalog tools match this advisory
0
ship the vulnerable code in their release binary (Go tools analyzed with govulncheck)
No
in the CISA KEV catalog
0.2%
EPSS for CVE-2026-9595, percentile 5

Catalog tools matching GHSA-mx8g-39q3-5c79

ToolVersion scannedPackageFixed inReleased binaryDeclared in or found inDispute
gatekeeper
Policy as Code
v3.23.1webpack-dev-server@4.9.3
npm
5.2.5not analyzedwebsite/yarn.lockDispute
cloudsplaining
Cloud Security
0.9.1webpack-dev-server@4.15.2
npm
5.2.5not analyzedpackage-lock.jsonDispute

Vulnerabilities are known advisories that Grype matches against the dependencies declared in each project's release source (manifests and lockfiles, including development and build dependencies). A match does not mean the tool is exploitable: the vulnerable code may be unused, test-only, or not shipped in the released binary. KEV: listed in the CISA Known Exploited Vulnerabilities catalog. EPSS: FIRST's estimated probability of exploitation in the next 30 days. Both describe the vulnerability in general, not its exploitability through this tool; a match in a workflow file refers to a GitHub Action, not to shipped code. Released binary is only analyzed for Go tools with a Linux release binary; other tools show not analyzed.

Advisory sources

GitHub advisory GHSA-mx8g-39q3-5c79 · NVD CVE-2026-9595 · OSV GHSA-mx8g-39q3-5c79

Grype data sources: https://github.com/advisories/GHSA-mx8g-39q3-5c79