{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"hickory-net","product":"hickory-dns","source":"CNA: VulnCheck","vendor":"hickory-dns","versions":[{"lessThan":"0.26.2","status":"affected","version":"0.26.0","versionType":"semver"},{"status":"unaffected","version":"0.26.2","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"hickory-proto","product":"hickory-dns","source":"CNA: VulnCheck","vendor":"hickory-dns","versions":[{"lessThanOrEqual":"0.25.2","status":"affected","version":"0.25.0","versionType":"semver"}]}],"cveId":"CVE-2026-123578","cwes":["CWE-290"],"description":"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},{"score":3.7,"severity":"low","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}],"modifiedAt":1794101893386,"publishedAt":1794101893386,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-3w89-7rx5-hpwx"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/hickory-dns-0.26.0-before-0.26.2-response-validation-bypass-via-qdcount-0"}],"remediation":[],"revision":"1f413d4770a674be65c8d38c21acd90c2661bfbf6dfe10f94919deb50b3b6e09","sources":[{"modifiedAt":1794101893386,"name":"CNA: VulnCheck","retrievedAt":1794103811556,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123578"}],"ssvc":null,"status":"published","title":"Hickory DNS 0.26.0 before 0.26.2 Response Validation Bypass via QDCOUNT=0","updatedAt":1794103811556}