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CVE-2026-56850

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

nodejs nodeRuntimes & languages
Open in ThreatlineRecord JSON
CVSS
4.1Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.08%Chance of exploitation activity in the next 30 days, higher than 0% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published30 Jul 2026Updated 30 Jul 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 30 Jul 2026, 06:02 UTCPublishedCVE List
  2. 23 Oct 2026, 23:44 UTCExploit code publicGitHub proof-of-concept repositories

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

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.

Text from CVE List

Affected versions 3

  • nodeaffected: 26.5.0 through 26.5.0CVE List
  • nodeaffected: 24.18.0 through 24.18.0CVE List
  • nodeaffected: 22.23.1 through 22.23.1CVE List

References 1