AIKIDO-2026-114877
hickory-resolver is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
hickory-resolverTL;DR
When the name server pool receives a response with the TC (truncated) bit set, it requeues the request to retry without inspecting the transport or counting iterations. An upstream that sets TC on every transport keeps the resolver retrying on a single connection until the wall-clock deadline. This ties up the resolver and denies timely resolution. The fix inspects the transport and bounds retries.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
hickory-resolver is vulnerable to Denial of Service (DoS) in versions 0.26.0 - 0.26.1.
How to fix this
Upgrade the hickory-resolver library to the patch version.
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