Is CVE-2026-56850 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-56850?

CVE-2026-56850 has a CVSS v3 severity of MEDIUM (4.1).

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CVE-2026-56850

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**.