{"id":"UBUNTU-CVE-2026-123584","details":"The hickory-net crate in Hickory DNS 0.26.0 before 0.26.2 stops listening and returns an error when a client UDP connection receives a datagram that cannot be parsed as a DNS message. Remote attackers who guess the query's source port, without knowing the transaction ID, can spoof malformed responses to abort client queries, causing denial of service.","modified":"2026-11-10T02:50:21.845432850Z","published":"2026-11-09T00:00:00Z","upstream":["CVE-2026-123584"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-123584"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-123584"},{"type":"REPORT","url":"https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-v44v-c8m4-gc43"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/hickory-dns-0.26.0-before-0.26.2-udp-client-denial-of-service-via-spoofed-responses"}],"affected":[{"package":{"name":"rust-hickory-net","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/rust-hickory-net?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.26.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-hickory-net-dev","binary_version":"0.26.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123584.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}