AIKIDO-2026-368233
hickory-resolver is vulnerable to Denial of Service (DoS)
75
High Risk
This Affects:
hickory-resolverTL;DR
When two zones reference each other through cyclic sibling name servers that lack the required glue records, the recursor keeps chasing the referrals in a loop until the per-request query budget is exhausted. Each pass issues additional upstream queries, producing exponential query amplification. Crafted zones can drive large volumes of traffic to upstream servers. The fix detects cyclic referrals and bounds the work.
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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