CVE-2026-56850

State: Published
Severity: 4.1 Medium
Published: Jul 30, 2026
Updated: Jul 30, 2026
Reserved: Jun 23, 2026

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**.

Scores

CVSS	Score	Vector	Source
3.0	4.1 Medium	CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N	hackerone

Weaknesses

CWE-287 Improper Authentication - Generic

Affected Products

Product	Versions
nodenodejs	26.5.0 through 26.5.0Affected 24.18.0 through 24.18.0Affected 22.23.1 through 22.23.1Affected

References

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

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