CVE-2026-56850

NameCVE-2026-56850
DescriptionA 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**.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
nodejs (PTS)bullseye12.22.12~dfsg-1~deb11u4vulnerable
bullseye (security)12.22.12~dfsg-1~deb11u8vulnerable
bookworm, bookworm (security)18.20.4+dfsg-1~deb12u2vulnerable
trixie (security), trixie20.19.2+dfsg-1+deb13u2vulnerable
forky, sid24.18.0+dfsg+~cs24.13.2-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
nodejssource(unstable)(unfixed)

Notes

https://nodejs.org/en/blog/vulnerability/july-2026-security-releases#https-agent-can-reuse-mtls-identities-across-pfx-certificates-cve-2026-56850---medium
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