AIKIDO-2026-610797
hickory-resolver is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
hickory-resolverTL;DR
For referrals that lack in-bailiwick glue, the recursor iterates every listed name server target and issues A and AAAA lookups for each, recursing with the same depth counters and no per-query width or work budget. Crafted delegations can fan this out into a large number of upstream queries. This enables amplification against remote servers and local resource exhaustion. The fix adds a per-query work budget.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use the recursive resolver
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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