CVE-2026-56850 — MEDIUM (4.1)

Vulnerability 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 Score

4.1

MEDIUM

CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-287

References

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

FAQ

What is CVE-2026-56850?

CVE-2026-56850 is a vulnerability with a CVSS score of 4.1 (MEDIUM). 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 cer...

How severe is CVE-2026-56850?

CVE-2026-56850 has been rated MEDIUM with a CVSS base score of 4.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-56850?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.