CVE-2026-56850: HTTPS Agent PFX object-array key collision allows mTLS client identity reuse across different per-request certificates

Published Jul 29, 2026
·
Updated

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.

Affected Software

14 affected componentsFixes available
Node.js Node.js>=26.0.0<27.0.0, >=24.0.0<25.0.0, >=22.0.0<23.0.0
Microsoft azl3 nodejs 24.17.0-1<24.18.1-1
24.18.1-1
Node.js Node.js>=22.0.0<22.23.2, >=24.0.0<24.18.1, >=26.0.0<26.5.1
22.23.224.18.126.5.1
Node.js Node.js>=22.0.0<22.23.2
22.23.2
Node.js Node.js>=24.0.0<24.18.1
24.18.1
Node.js Node.js>=26.0.0<26.5.1
26.5.1
Nodejs Node.js>=22.0<=22.23.1
Nodejs Node.js>=24.0.0<=24.18.0
Nodejs Node.js>=26.0.0<=26.5.0
alpine/nodejs<22.23.2-r0
22.23.2-r0
alpine/nodejs<22.23.2-r0
22.23.2-r0
alpine/nodejs<24.18.1-r0
24.18.1-r0
alpine/nodejs<24.18.1-r0
24.18.1-r0
alpine/nodejs-current<26.5.1-r0
26.5.1-r0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 24.18.1-1
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 22.23.2Fixed in 24.18.1Fixed in 26.5.1
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 22.23.2
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 24.18.1
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 26.5.1
  6. Upgrade

    Upgrade alpine/nodejs to a version that resolves this vulnerability.

    Fixed in 22.23.2-r0
  7. Upgrade

    Upgrade alpine/nodejs to a version that resolves this vulnerability.

    Fixed in 24.18.1-r0
  8. Upgrade

    Upgrade alpine/nodejs-current to a version that resolves this vulnerability.

    Fixed in 26.5.1-r0

Event History

Jul 29, 2026
CVE Published
via Node.js·12:00 AM
Data Sourced
via Node.js·12:00 AM
DescriptionSeverityAffected Software
Jul 30, 2026
CVE Published
via MITRE·06:02 AM
Data Sourced
via MITRE·06:02 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:25 AM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via OSV·06:25 AM
Affected Software
Aug 7, 2026
Data Sourced
via Microsoft·08:00 AM
DescriptionSeverityWeaknessAffected Software
Oct 23, 2026
Exploit Published
via GitHub·11:44 PM

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2026-56850?

The severity of CVE-2026-56850 is rated as medium with a CVSS score of 4.1.

2

How does CVE-2026-56850 affect Node.js?

CVE-2026-56850 affects Node.js versions 26.x, 24.x, and 22.x by allowing PFX object-array key collisions.

3

What is the impact of the CVE-2026-56850 vulnerability?

The impact of CVE-2026-56850 includes the potential reuse of mutual TLS (mTLS) client identities across different requests.

4

How do I mitigate CVE-2026-56850?

To mitigate CVE-2026-56850, update to a patched version of Node.js that resolves this vulnerability.

5

Is CVE-2026-56850 exploitable in all configurations?

CVE-2026-56850 is exploitable in configurations where different client certificates are used on the same HTTPS Agent.

Company

Resources

Contact

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