rust-hickory-proto: hickory-proto and hickory-resolver 0.26.0 before 0.26.2, hickory-server 0.25.0-alpha.1 before 0.26.2, and hickory-rec...
CVE-2026-123603 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-123603, released November 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.
hickory-proto and hickory-resolver 0.26.0 before 0.26.2, hickory-server 0.25.0-alpha.1 before 0.26.2, and hickory-recursor 0.25.0-alpha.3 through 0.26.0-alpha.1 fail to canonicalize IPv4-mapped IPv6 addresses when checking deny_answers, deny_server, or AccessControlSet rules. Attackers can use IPv4-mapped addresses to evade answer filtering, trigger queries to denied nameservers, or reach hickory-server library deployments on dual-stack IPv6 sockets from denied clients.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rust-hickory-proto · Debian 14 | 0.26.3-1 | DEBIAN-CVE-2026-123603 | Nov 9, 2026 |
| rust-hickory-resolver · Debian 14 | 0.26.3-1 | DEBIAN-CVE-2026-123603 | Nov 9, 2026 |
| rust-hickory-server · Debian 14 | 0.26.3-1 | DEBIAN-CVE-2026-123603 | Nov 9, 2026 |
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