{"id":"CVE-2026-123578","title":"Hickory DNS 0.26.0 before 0.26.2 Response Validation Bypass via QDCOUNT=0","summary":"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 c…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-290"],"vendor":"hickory-dns","product":"hickory-dns","affected":["hickory-dns >= 0.26.0 < 0.26.2","hickory-dns >= 0.25.0 <= 0.25.2"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:13.386Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123578","references":[{"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-3w89-7rx5-hpwx","label":"GitHub Security Advisory (GHSA-3w89-7rx5-hpwx)"},{"url":"https://www.vulncheck.com/advisories/hickory-dns-0.26.0-before-0.26.2-response-validation-bypass-via-qdcount-0","label":"VulnCheck Advisory: Hickory DNS 0.26.0 before 0.26.2 Response Validation Bypass via QDCOUNT=0"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.653Z","slug":"CVE-2026-123578","body":"## Overview\n\nHickory 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.\n\n## Affected\n\n- `hickory-dns >= 0.26.0 < 0.26.2`\n- `hickory-dns >= 0.25.0 <= 0.25.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}