What is CVE-2026-56850?

CVE-2026-56850 is a medium-severity vulnerability in Node.js Node, classified under Improper Authentication. CVSS score: 4.4/10. Published 2026-07-30.

How severe is CVE-2026-56850?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Auth bypass in Node.js Node

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**.

Vulnerability class: Broken Authentication

EPSS: 0.001 (0.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.

Affected products

Nodejs Node — versions 26.5.0, 24.18.0, 22.23.1
Nodejs Node.js

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

support@hackerone.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-56850?: CVE-2026-56850 is a medium-severity vulnerability in Node.js Node, classified under Improper Authentication. CVSS score: 4.4/10. Published 2026-07-30.
How severe is CVE-2026-56850?: Medium severity. CVSS v3 base score is 4.4 out of 10.