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CVE-2026-56850

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-30 · updated 2026-10-23
• Weakness: CWE-287

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**.

Affected products

• Node.js: from 22.0 through 22.23.1; from 24.0.0 through 24.18.0; from 26.0.0 through 26.5.0

References

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

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