rust-hickory-proto: The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates record vectors size...
CVE-2026-123570 is fixed in rust-hickory-proto on 1 platform by DEBIAN-CVE-2026-123570 (version 0.26.3-1), released November 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rust-hickory-proto · Debian 14 | 0.26.3-1 | DEBIAN-CVE-2026-123570 | Nov 9, 2026 |
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