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CVE-2026-123867

node · Vulnerability

CVSS 3.1 4.2 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-123867

Published

A per-host mutual-TLS authorization bypass in Node.js lets a client authorized for the default hostname reach a protected hostname it is not authorized for. When a TLS server assigns a hostname a different client-certificate CA with `server.addContext(host, { ca: protectedCA })` but no server certificate in that SNI context, the per-host client CA is never installed and the handshake falls back to the default client CA. In `src/crypto/crypto_tls.cc`, `CertCbDone` installs the SNI context's CA only when `setSniContext` succeeds, but `setSniContext` returns `false` for a context with no server certificate, so a CA-only SNI context silently keeps the default CA. A client holding a certificate trusted by the default CA, but not the protected CA, can therefore complete mTLS to the protected hostname and read its response even with `requestCert` and `rejectUnauthorized` enabled, while a client certified by the protected CA is rejected. This vulnerability affects Node.js 26.x, 24.x, and 22.x.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-123867

Published

node

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nodejs",
                    "product": "node",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0.0.0",
                            "lessThan": "22.23.5",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "23.0.0",
                            "lessThan": "24.22.3",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "25.0.0",
                            "lessThan": "26.13.1",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

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Sources read 12 Nov 19:39 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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