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

CVE-2026-123576

Description

Hickory DNS 0.24.0 through 0.26.1 contains a memory exhaustion vulnerability that allows remote attackers to consume server resources by sending incomplete DNS-over-QUIC request bodies. Attackers can open many connections and send only large length prefixes, causing pre-allocated buffers to persist without timeout and exhausting server memory.

Affected products

Hickory DNS/Hickory DNSllm-fuzzy
Range: 0.24.0 - 0.26.1

Patches

Vulnerability mechanics

References

github.com/hickory-dns/hickory-dns/security/advisories/GHSA-2f4m-fq7w-mrgxnvd
www.vulncheck.com/advisories/hickory-dns-0.24.0-through-0.26.1-memory-exhaustion-via-dns-over-quic-requestsnvd

News mentions

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