CVE-2026-56850

Severity CVSS v4.0:

Pending analysis

Type:

CWE-287 Authentication Issues

Publication date:

30/07/2026

Last modified:

30/07/2026

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.<br /> <br /> This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.

Impact

Vector 3.x

CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 4.10 MEDIUM
Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N

Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): High
Availability (A): None

Base Score 3.x

4.10

Severity 3.x

MEDIUM

References to Advisories, Solutions, and Tools

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