undici's BalancedPool constructor passes its entire options object through an internal deep-clone that serializes and reparses the value as JSON. Because JSON cannot represent functions, any function-valued TLS option, such as a caller-supplied checkServerIdentity callback or a custom connector inside the connect option, is silently discarded before it reaches the TLS layer. As a result a peer whose certificate the application's custom checkServerIdentity was written to reject, but which still passes Node's default hostname and chain checks, is accepted when reached through BalancedPool. The Client, Pool, and Agent dispatchers are not affected because they extract the connect and tls options before cloning. This affects undici versions from 7.24.1 up to 7.29.1 and from 8.0.0 up to 8.10.2, and only when the application supplies a function-valued connect or tls option to BalancedPool. Users should upgrade to undici 7.29.1 or 8.10.2.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade nodejs-packaging-bundlerUpgrade nodejs-nodemonUpgrade nodejs-packagingUpgrade nodejs-full-i18nUpgrade nodejs-libsUpgrade v8-13.6-develUpgrade nodejs-docsUpgrade nodejs-develUpgrade npmUpgrade nodejs | Oct 14, 2026 | Sep 30, 2026 |
| Amazon_linux_2023 | — | Upgrade v8-13.6-develUpgrade nodejs24-debuginfoUpgrade nodejs24-full-i18nUpgrade nodejs24Upgrade nodejs24-debugsourceUpgrade nodejs24-libs-debuginfoUpgrade nodejs24-develUpgrade nodejs24-npmUpgrade nodejs24-docsUpgrade nodejs24-libs | Sep 30, 2026 | Sep 4, 2026 |
| Redhat_linux | — | Upgrade nodejs-nodemonUpgrade nodejs24-docsUpgrade nodejs24-npmUpgrade nodejs-full-i18nNo solution existsUpgrade nodejs-libsUpgrade nodejs24-libs-debuginfoUpgrade nodejs-packagingUpgrade npmUpgrade nodejs24Upgrade nodejs24-libsUpgrade nodejs24-debugsourceUpgrade nodejs-develUpgrade nodejs-debugsourceUpgrade nodejs24-develUpgrade nodejs-debuginfoUpgrade v8-13.6-develUpgrade nodejsUpgrade nodejs-packaging-bundlerUpgrade nodejs24-full-i18nUpgrade nodejs24-debuginfoUpgrade nodejs-docsUpgrade nodejs-libs-debuginfo | Sep 7, 2026 | Sep 4, 2026 |
| Rocky_linux | — | Upgrade nodejs-full-i18nUpgrade nodejs24-libsUpgrade nodejs-libs-debuginfoUpgrade nodejs-libsUpgrade nodejs24-debugsourceUpgrade nodejs-debugsourceUpgrade nodejsUpgrade nodejs24Upgrade nodejs24-develUpgrade nodejs-develUpgrade nodejs24-full-i18nUpgrade nodejs24-libs-debuginfoUpgrade nodejs24-debuginfoUpgrade nodejs-debuginfoUpgrade v8-13.6-devel | Oct 5, 2026 | Oct 1, 2026 |
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