HIGH 8.7 NVD
CVE-2026-123570
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 AR
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.
References
- https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-67wc-6jq8-ghrc
- https://www.vulncheck.com/advisories/hickory-dns-from-0.18-before-0.26.2-memory-amplificat
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-11-08 via NVD.
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