AIKIDO-2026-571400
hickory-resolver is vulnerable to Denial of Service (DoS)
50
Medium Risk
This Affects:
hickory-resolverTL;DR
When the recursor follows a referral that lacks glue records and all address lookups for the referred name servers fail, it constructs and caches a name server pool that contains no usable connections. Later queries for the same zone reuse the empty pool and fail until the cache entry expires or is evicted. A spoofing attack can trigger this to deny resolution of a targeted zone. The fix avoids caching an empty pool.
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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