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CVE-2026-84961 is an improper certificate validation vulnerability in the undici HTTP client library's BalancedPool dispatcher. BalancedPool deep-clones its complete options object through JSON serialization and reparsing, which silently removes function-valued options before they reach the TLS layer. This can discard a caller-supplied checkServerIdentity callback or custom connector supplied through the connect option. A peer certificate that the application's custom validation was intended to reject can consequently be accepted when it passes Node.js default hostname and certificate-chain validation. Client, Pool, and Agent dispatchers are not affected because they extract connect and TLS options before cloning.
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A TLS certificate-validation bypass in undici's BalancedPool caused by dropped connection options. The supplied CVSS vector indicates network-reachable high confidentiality and integrity impact. It affects Node.js 24 packages on Rocky Linux 8.
A TLS certificate-validation bypass in undici's BalancedPool, caused by dropped connection options.
A TLS certificate-validation bypass in undici's BalancedPool component caused by dropped connection options.
A remotely exploitable vulnerability addressed in AlmaLinux ALSA-2026:73428 affecting AlmaLinux 10 Node.js 24 packages. The listed CVSS v3 vector indicates network access, low complexity, no privileges or user interaction, and high confidentiality and integrity impact, with no availability impact.
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