CVE-2026-56850

A flaw in Node.js HTTPS Agent connection reuse can cause PFX object-array key collisions, allowing mutual TLS (mTLS) client identities to be reused across requests configured with different client certificates. This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.

Score

CVSS 3.1 4.4 Medium

Status

Analyzed - support@hackerone.com

Published

2026-07-30

Last modified

2026-10-23

Weaknesses

CWE-287

Affected products

• Node (Nodejs)
• Node.js (Nodejs)

References

• https://nodejs.org/en/blog/vulnerability/july-2026-security-releases