High severity7.5NVD Advisory· Published Nov 8, 2026

CVE-2026-123570

Description

The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates record vectors sized by the untrusted ANCOUNT, NSCOUNT, and ARCOUNT header fields before reading record data. Remote attackers can send a UDP datagram, or a spoofed response to a client/resolver, with these counts set to 65535, forcing about 18MB of allocation per message.

Affected products

Hickory DNS/Hickory DNSllm-fuzzy
Range: <0.26.2

Patches

Vulnerability mechanics

References

github.com/hickory-dns/hickory-dns/security/advisories/GHSA-67wc-6jq8-ghrcnvd
www.vulncheck.com/advisories/hickory-dns-from-0.18-before-0.26.2-memory-amplification-dos-via-rr-countsnvd

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000