CVE-2026-123578
Hickory DNS 0.26.0 before 0.26.2 Response Validation Bypass via QDCOUNT=0
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
Hickory DNS hickory-net 0.26.0 before 0.26.2 and hickory-proto 0.25.0 through 0.25.2 skip the check that a UDP response's question section matches the query when the response has an empty question section (QDCOUNT=0), and also skip the case-randomization check. Remote attackers able to inject spoofed UDP responses can send QDCOUNT=0 responses to bypass these checks, weakening defenses against DNS spoofing.
| CWE | CWE-290 |
| Vendor | hickory-dns |
| Product | hickory-dns |
| Published | Nov 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
hickory-dns / hickory-dns
0.26.0 < 0.26.2
hickory-dns / hickory-dns
0.25.0 ≤ 0.25.2
References
Credits
🔍 qifan-sailboat