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Impact: undici's ProxyAgent silently drops the requestTls option when configured with a SOCKS5 proxy URI (socks5:// or socks://). The target HTTPS connection through the SOCKS5 tunnel falls back to Node's default trust store, ignoring user-configured ca, cert, key, rejectUnauthorized, and servername settings.
Applications that pin to an internal or corporate CA via requestTls.ca will, when their proxy URI is SOCKS5, get the default Mozilla CA bundle as the trust anchor instead. Any cert signed by any publicly-trusted CA for the target hostname is accepted, breaking the intended pin and enabling MITM read and tamper of the HTTPS exchange.
Affected applications are those that use undici's ProxyAgent (or Socks5ProxyAgent directly) with SOCKS5 AND rely on requestTls for TLS scope restriction. The bug was introduced in undici 7.23.0 when SOCKS5 support was added.
Patches: Upgrade to undici v7.28.0 or v8.5.0.
Workarounds: No workaround is available within the SOCKS5 path. If a SOCKS5 proxy with TLS scope restriction is required and an upgrade is not yet possible, route the traffic through an HTTP-proxy ProxyAgent instead, where requestTls is honored correctly.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade npmUpgrade nodejs-full-i18nUpgrade nodejsUpgrade nodejs-packaging-bundlerUpgrade nodejs-develUpgrade nodejs-nodemonUpgrade nodejs-packagingUpgrade nodejs-libsUpgrade nodejs-docsUpgrade v8-13.6-devel | Jul 7, 2026 | Jul 6, 2026 |
| Amazon_linux_2023 | — | Upgrade nodejs24-npmUpgrade v8-13.6-develUpgrade nodejs24-libsUpgrade nodejs24Upgrade nodejs24-full-i18nUpgrade nodejs24-develUpgrade nodejs24-debugsourceUpgrade nodejs24-docsUpgrade nodejs24-debuginfoUpgrade nodejs24-libs-debuginfo | Jul 8, 2026 | Jun 17, 2026 |
| Redhat_linux | — | Upgrade nodejs24-debugsourceUpgrade nodejs-libs-debuginfoUpgrade nodejs-packaging-bundlerUpgrade nodejs-debuginfoUpgrade nodejs24-debuginfoUpgrade nodejs-nodemonUpgrade nodejs24-docsUpgrade nodejs24-full-i18nUpgrade nodejs-packagingUpgrade nodejs-debugsourceUpgrade nodejs-docsUpgrade v8-13.6-develUpgrade nodejs24Upgrade nodejs-libsUpgrade nodejs24-npmUpgrade nodejs-full-i18nUpgrade nodejsUpgrade nodejs-develUpgrade npmUpgrade nodejs24-libs-debuginfoUpgrade nodejs24-libsUpgrade nodejs24-devel | Jul 7, 2026 | Jun 17, 2026 |
| Rocky_linux | — | Upgrade nodejs24-develUpgrade nodejs-full-i18nUpgrade nodejs24-debugsourceUpgrade nodejs-libsUpgrade nodejs-debugsourceUpgrade nodejsUpgrade nodejs-libs-debuginfoUpgrade nodejs-debuginfoUpgrade nodejs24Upgrade nodejs24-full-i18nUpgrade v8-13.6-develUpgrade nodejs24-debuginfoUpgrade nodejs-develUpgrade nodejs24-libs-debuginfoUpgrade nodejs24-libs | Jul 13, 2026 | Jul 7, 2026 |
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