Medium [CVE-2026-56850] mTLS client identities can be reused due to HTTPS Agent connection flaw
This medium-severity Red Hat Linux advisory covers CVE-2026-56850 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8.
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Summary
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**.
A flaw was found in Node.js. The HTTPS Agent, responsible for managing secure connections, can incorrectly reuse client identities across different requests.
As a result, a client's identity, established through mutual TLS (mTLS) authentication, could be mistakenly applied to another request, potentially leading to unauthorized access or identity spoofing.
This can lead to unintended identity confusion if applications are configured to use different client certificates with reused connections, potentially enabling unauthorized access within the mTLS context. Red Hat severity: Moderate — CVSS 4.1 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N).
Weakness: CWE-303. Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Will not fix / out of support: Red Hat Hardened Images. Red Hat fixing advisory: RHSA-2026:48273, RHSA-2026:48305, RHSA-2026:48537.
Affected products named by the advisory: Red Hat package: nodejs22; Red Hat package: nodejs24.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
- nodejs26-main-26.5.1-1.5.hum1
- nodejs22-main-22.23.2-2.3.hum1
- nodejs24-main-24.18.1-0.1.hum1
- RHSA-2026:48273
- RHSA-2026:48305
- RHSA-2026:48537
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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