CVE-2026-56850
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Node.js HTTPS Agent PFX Key Collision mTLS Identity Reuse

Publication date: 2026-07-30

Last updated on: 2026-07-30

Assigner: HackerOne

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**.

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Meta Information

Published
2026-07-30
Last Modified
2026-07-30
Generated
2026-08-19
AI Q&A
2026-07-30
EPSS Evaluated
2026-08-18
NVD
CVE-2026-56850
EUVD
EUVD-2026-51020

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
nodejs node.js 26.x
nodejs node.js 24.x
nodejs node.js 22.x
nodejs node.js From 26.x (inc)
nodejs node.js From 24.x (inc)
nodejs node.js From 22.x (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

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Executive Summary

This vulnerability is a flaw in Node.js HTTPS Agent connection reuse that causes PFX object-array key collisions. This allows mutual TLS (mTLS) client identities to be reused across requests even when different client certificates are configured.

Detection Guidance

To detect this vulnerability, check if your Node.js version is 22.x, 24.x, or 26.x. Inspect HTTPS Agent usage in your applications for improper client certificate configurations. No specific commands are provided in the context.

Impact Analysis

It could allow unauthorized reuse of client identities in mTLS setups, potentially leading to unauthorized access to protected resources or data breaches. The impact is limited to systems using Node.js versions 26.x, 24.x, and 22.x with HTTPS Agent and mTLS configurations.

Compliance Impact

This vulnerability may lead to unauthorized access or data leaks, which could violate compliance requirements such as GDPR (data protection) or HIPAA (health information privacy). Organizations using affected Node.js versions should address this to maintain regulatory compliance.

Mitigation Strategies

Update Node.js to the latest patched version in the 26.x, 24.x, or 22.x release lines to address the flaw in HTTPS Agent connection reuse.

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