Detections
Analytics

SCA: security update for webpack-dev-server (GHSA-mx8g-39q3-5c79)

medium Tenable Self-Hosted Container Security Plugin ID 443351

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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
 [email protected]. 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. (CVE-2026-9595)

Solution

Update the webpack-dev-server library and its related packages to version 5.2.5 or later.

See Also

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

Plugin Details

Severity: Medium

ID: 443351

Version: Revision 1.2

Type: Local

Family: SCA Checks

Published: 6/17/2026

Updated: 7/1/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS Score Source: CVE-2026-9595

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/17/2026

Vulnerability Publication Date: 6/15/2026

Reference Information

CVE: CVE-2026-9595