CVE-2026-123576 · Package
NO FIX YET · SEE WHAT TO DO
Hickory DNS, a DNS server library and server, lets a remote attacker open many DNS-over-QUIC connections and send only large length prefixes. The server pre-allocates buffers for those requests that never time out, so memory runs out.
first public Sep 3, 2026 · 1 source
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Systems running Hickory DNS 0.24.0 through 0.26.1 with DNS-over-QUIC enabled are exposed, because the flaw is in the QUIC request handling. Servers that only use plain DNS, DNS-over-TLS, or DNS-over-HTTPS are not described as affected by the sources. Resolvers built on other DNS software are not affected.
Not affected if dns-over-quic-disabled, other-dns-software
Who cares dns-over-quic, dns-server, hickory-dns, rust
Cargo.lock or dependency tree (for example cargo tree -i hickory-proto or cargo tree -i hickory-server).0.26.1 (the affected range is 0.24.0 through 0.26.1; the exact fixed version is unknown from these sources).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.
This page as .md · .json · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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