Access of Resource Using Incompatible Type ('Type Confusion') Affecting nodejs:20/nodejs package, versions *


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.01% (3rd percentile)

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  • Snyk IDSNYK-RHEL8-NODEJS-15893509
  • published4 Apr 2026
  • disclosed30 Mar 2026

Introduced: 30 Mar 2026

NewCVE-2026-21710  (opens in a new tab)
CWE-843  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 nodejs:20/nodejs.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nodejs:20/nodejs package and not the nodejs:20/nodejs package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw in Node.js HTTP request handling causes an uncaught TypeError when a request is received with a header named __proto__ and the application accesses req.headersDistinct.

When this occurs, dest["__proto__"] resolves to Object.prototype rather than undefined, causing .push() to be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be intercepted by error event listeners, meaning it cannot be handled without wrapping every req.headersDistinct access in a try/catch.

  • This vulnerability affects all Node.js HTTP servers on 20.x, 22.x, 24.x, and v25.x

CVSS Base Scores

version 3.1