CVE-2026-123867 - Node.js is vulnerable to a per-host mTLS authorization bypass via a CA-only SNI context failing open to the default CA

CVE-2026-123867 - Node.js is vulnerable to a per-host mTLS authorization bypass via a CA-only SNI context failing open to the default CA

https://cvefeed.io/rssfeed/latest.atom / Wed, 11/11/2026 - 20:08
CVE ID :CVE-2026-123867
Published : Nov. 11, 2026, 6:23 p.m. | 35 minutes ago
Description :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.
Severity: 4.2 | MEDIUM
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