Authentication Bypass in Node.js HTTPS Agent connection reuse (CVE-2026-56850)
Summary
Authentication bypass in Node.js HTTPS Agent connection reuse (CVE-2026-56850). Data can be tampered with by attackers.
Original description
The description as published by the source.
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.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-56850 has been found in Node.js HTTPS Agent connection reuse.
Data can be tampered with by attackers. CVSS score: 4.4/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Node.js HTTPS Agent connection reuse CVE-2026-56850" on the vendor's site.
CVE-2026-56850 (Node.js HTTPS Agent connection reuse) — CWE-287 / CVSS v3 4.4
Attack vector: local / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Authentication bypass (CWE-287) exists in Node.js HTTPS Agent connection reuse.
Check the vendor advisory for the affected versions of Node.js HTTPS Agent connection reuse.
Severity: Medium (CVSS 4.4/10). Data can be tampered with by attackers.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Node.js HTTPS Agent connection reuse を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- patch support@hackerone.com
- web nvd.nist.gov
- web github.com