rust-hickory-net: Hickory DNS hickory-proto through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 contain an NSEC validati...
CVE-2026-123594 is fixed in rust-hickory-net on 1 platform by DEBIAN-CVE-2026-123594 (version 0.26.3-1), released November 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Hickory DNS hickory-proto through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 contain an NSEC validation flaw that returns a secure proof for NXDOMAIN responses when the covering NSEC's Next Domain Name is a strict descendant of the query name, which actually proves the name exists as an empty non-terminal. On-path attackers can flip the unsigned rcode of a genuine signed NODATA response from NOERROR to NXDOMAIN, causing validators to accept forged nonexistence of the name.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rust-hickory-net · Debian 14 | 0.26.3-1 | DEBIAN-CVE-2026-123594 | Nov 9, 2026 |
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