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

- 種別: advisory
- 重大度: high
- 関連技術: nodejs
- CVE: CVE-2026-109383
- 公開日時: 2026-10-27T19:02:26.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-2m5v-pch6-74hx)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-2m5v-pch6-74hx

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…