AIKIDO-2026-191928
hickory-proto is vulnerable to Denial of Service (DoS)
50
Medium Risk
This Affects:
hickory-protoTL;DR
The DNS wire-format parser pre-allocates record vectors from the ANCOUNT, NSCOUNT, and ARCOUNT header fields before reading the record data. A single datagram that sets these counts to their maximum forces large allocations even though parsing then fails. In client and resolver mode this path is reachable via spoofed responses, causing remote memory amplification. The fix avoids trusting the declared counts for pre-allocation.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
hickory-proto is vulnerable to Denial of Service (DoS) in versions 0.24.0 - 0.26.1.
How to fix this
Upgrade the hickory-proto library to the patch version.
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