CVE-2026-56850 Auth bypass in node

What is CVE-2026-56850?

CVE-2026-56850 is a medium-severity authentication bypass vulnerability in Nodejs Node.js, published on 30 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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**.

Weakness: CWE-287

Which versions are affected by CVE-2026-56850?

2 open source packages ship an affected version, including node and node-min. It affects 1 product.

Products include Nodejs Node.js.

How do I fix CVE-2026-56850?

Upgrade node to a fixed version for your release line: 22.23.2, 24.18.1 or 26.5.1.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-56850 being exploited?

There is no known exploitation of CVE-2026-56850 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Nodejs Node.js

• CVE-2023-32002 Security feature bypass in Node Critical 9.8
• CVE-2016-6303 Integer overflow in n/a Critical 9.8
• CVE-2017-15896 Security feature bypass in Node.js Critical 9.1
• CVE-2018-7160 Server-side request forgery in Node.js High 8.8
• CVE-2018-12120 Misconfiguration in Node.js High 8.1

All Nodejs Node.js vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-56850, AZL-94337, BELL-CVE-2026-56850, BIT-node-2026-56850, BIT-node-min-2026-56850, CLEANSTART-2026-LA29033 and 12 more.