Auth bypass in Node.js Node
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 certificates.
This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS 0.001, 0.2th percentile (scored ); unchanged over 30 days. About EPSS.
Affected products
- Node.js Node — versions 26.5.0, 24.18.0, 22.23.1
- Node.js
Weakness classification (CWE)
Public exploits and proof-of-concept code
5 public repositories with exploit or proof-of-concept code for this CVE:
- CompleTech-Security/node-cve-2026-56850-check (last pushed 2026-10-26): Offline Node.js evidence checker for CVE-2026-56850: HTTPS Agent PFX client identity collision. Single-file Python; JSON/CSV/HTML reports; no exploit payloads.
- CompleteTech-Security/node-cve-2026-56850-check (last pushed 2026-10-26): Offline Node.js evidence checker for CVE-2026-56850: HTTPS Agent PFX client identity collision. Single-file Python; JSON/CSV/HTML reports; no exploit payloads.
- CompleTetech-Security/node-cve-2026-56850-check (last pushed 2026-10-26): Offline Node.js evidence checker for CVE-2026-56850: HTTPS Agent PFX client identity collision. Single-file Python; JSON/CSV/HTML reports; no exploit payloads.
- completetech-security/node-cve-2026-56850-check (last pushed 2026-10-24): Standalone defensive checker project for CVE-2026-56850: Node.js: HTTPS Agent PFX client identity collision. One exploit per repository; implementation pending.
- CompleteTech-LLC/node-cve-2026-56850-check (last pushed 2026-10-24): Standalone defensive checker project for CVE-2026-56850: Node.js: HTTPS Agent PFX client identity collision. One exploit per repository; implementation pending.
References
- nodejs.org/en/blog/vulnerability/july-2026-security-releases (Vendor Advisory)
This CVE has public exploit evidence. See the latest CVEs with public exploits.