{"id":"UBUNTU-CVE-2026-3593","details":"A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.","modified":"2026-05-29T10:45:34.583024670Z","published":"2026-05-20T00:00:00Z","related":["USN-8293-1"],"upstream":["CVE-2026-3593"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-3593"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-3593"},{"type":"REPORT","url":"https://kb.isc.org/docs/cve-2026-3593"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8293-1"}],"affected":[{"package":{"name":"bind9-libs","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/bind9-libs?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:9.11.16+dfsg-3~build1","1:9.11.16+dfsg-3~ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libbind9-161"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libdns-export1109"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libdns1109"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libirs-export161"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libirs161"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libisc-export1105"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libisc1105"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libisccc-export161"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libisccc161"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libisccfg-export163"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"libisccfg163"},{"binary_version":"1:9.11.16+dfsg-3~ubuntu1","binary_name":"liblwres161"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3593.json"}},{"package":{"name":"bind9-libs","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/bind9-libs?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:9.11.19+dfsg-2.1ubuntu1","1:9.11.19+dfsg-2.1ubuntu2","1:9.11.19+dfsg-2.1ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libbind9-161"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libdns-export1110"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libdns1110"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libirs-export161"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libirs161"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libisc-export1105"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libisc1105"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libisccc-export161"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libisccc161"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libisccfg-export163"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"libisccfg163"},{"binary_version":"1:9.11.19+dfsg-2.1ubuntu3","binary_name":"liblwres161"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3593.json"}},{"package":{"name":"bind9","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/bind9?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.11-1ubuntu2.4"}]}],"versions":["1:9.20.4-3ubuntu1","1:9.20.4-3ubuntu2","1:9.20.4-3ubuntu3","1:9.20.9-2ubuntu1","1:9.20.10-1ubuntu1","1:9.20.11-1ubuntu1","1:9.20.11-1ubuntu2","1:9.20.11-1ubuntu2.1","1:9.20.11-1ubuntu2.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:9.20.11-1ubuntu2.4","binary_name":"bind9"},{"binary_version":"1:9.20.11-1ubuntu2.4","binary_name":"bind9-dnsutils"},{"binary_version":"1:9.20.11-1ubuntu2.4","binary_name":"bind9-host"},{"binary_version":"1:9.20.11-1ubuntu2.4","binary_name":"bind9-libs"},{"binary_version":"1:9.20.11-1ubuntu2.4","binary_name":"bind9-utils"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3593.json"}},{"package":{"name":"bind9","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/bind9?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.18-1ubuntu2.1"}]}],"versions":["1:9.20.11-1ubuntu2","1:9.20.11-1ubuntu3","1:9.20.18-1ubuntu1","1:9.20.18-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:9.20.18-1ubuntu2.1","binary_name":"bind9"},{"binary_version":"1:9.20.18-1ubuntu2.1","binary_name":"bind9-dnsutils"},{"binary_version":"1:9.20.18-1ubuntu2.1","binary_name":"bind9-host"},{"binary_version":"1:9.20.18-1ubuntu2.1","binary_name":"bind9-libs"},{"binary_version":"1:9.20.18-1ubuntu2.1","binary_name":"bind9-utils"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3593.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}