| Name | CVE-2026-56850 |
| 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**. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6517-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| nodejs (PTS) | bookworm, bookworm (security) | 18.20.4+dfsg-1~deb12u2 | vulnerable |
| trixie | 20.19.2+dfsg-1+deb13u2 | vulnerable | |
| trixie (security) | 20.19.2+dfsg-1+deb13u3 | fixed | |
| forky, sid | 24.21.0+dfsg+~cs24.13.4-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| nodejs | source | trixie | 20.19.2+dfsg-1+deb13u3 | DSA-6517-1 | ||
| nodejs | source | (unstable) | 24.19.0+dfsg+~cs24.13.3-1 |
https://nodejs.org/en/blog/vulnerability/july-2026-security-releases#https-agent-can-reuse-mtls-identities-across-pfx-certificates-cve-2026-56850---medium
Fixed by: https://github.com/nodejs/node/commit/acaf4266b2be7958e3d7cb44b5ee1c2b96eca278 (v22.23.2)