AIKIDO-2026-559286
undici is vulnerable to Improper Certificate Validation
74
High Risk
This Affects:
undiciTL;DR
BalancedPool deep-clones constructor options with JSON, which silently drops function-valued connect and tls options such as a caller-supplied checkServerIdentity. A certificate the application was written to reject is then accepted if it still passes Node's default hostname and chain checks. Client, Pool, Agent, and RoundRobinPool are not affected because they destructure those options before the clone. The fix preserves connect and tls outside the JSON clone so custom verification callbacks reach each upstream.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you construct a BalancedPool with function-valued connect or tls options.
Background info
undici is vulnerable to Improper Certificate Validation in versions 7.24.1 - 7.29.0 and 8.0.0 - 8.10.1.
How to fix this
Upgrade the undici library to the patch version.
Links
GitHub Release
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