undici vulnerable to TLS certificate validation bypass via dropped tls options in Agent

影響: npm:undici >= 4.0.0, < 6.29.1 → 6.29.1, npm:undici >= 7.0.0, < 7.30.1 → 7.30.1, npm:undici >= 8.0.0, < 8.12.2 → 8.12.2

undici's Agent passes its constructor options through a JSON-based deep clone (JSON.parse(JSON.stringify(...))) before forwarding them to each per-origin Pool. JSON cannot represent functions, so a caller-supplied tls option containing a checkServerIdentity callback is silently dropped before it reaches the TLS layer. As a result, a TLS peer whose certificate a custom checkServerIdentity was written to reject, but which passes Node's default hostname and chain checks, is silently accepted when…

Read on GitHub Advisory Database

On 10/28/2026, 04:02 AM, GitHub Advisory Database published "undici vulnerable to TLS certificate validation bypass via dropped tls options in Agent" (type: Advisory). Severity is "High" (high). Related technologies: JavaScript / Node.js. CVE: CVE-2026-109383.