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Vulnerability record · CVE-2026-56850 · published 30 July 2026

CVE-2026-56850: Nodejs node.js improper authentication vulnerability

Nodejs · Node.Js

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**.

4.4 CVSS 3.1 Medium EPSS 0.09% · top 99.6% CWE-287 · Improper authentication
4.4CVSS 3.1 base score
0.09%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
25 Aug 2026Last modified by NVD

Description

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**.

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://nodejs.org/en/blog/vulnerability/july-2026-security-releases Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-56850), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.