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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…

Medium4.1EPSS 0.08%
Published
Updated
Reserved
Assigned by
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**.

Timeline

  1. ID reserved

    By hackerone

  2. · 37 days later

    Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-56850, by who scored it
Scored byCVSSScoreVector
hackeroneCNA (assigner)3.0Medium4.1CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
NVDNVD · Analyzed3.1Medium4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
EPSS (exploitation in 30 days)
0.08% · top 100% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.1.

Weakness

Affected products

  • nodejs · node

    • affected 26.5.0 – ≤ 26.5.0
    • affected 24.18.0 – ≤ 24.18.0
    • affected 22.23.1 – ≤ 22.23.1

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .