{"id":"DEBIAN-CVE-2026-5946","details":"Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data — can cause assertion failures in `named`. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","modified":"2026-09-18T08:47:35.451415984Z","published":"2026-05-20T13:16:40.157Z","upstream":["CVE-2026-5946"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-5946"}],"affected":[{"package":{"name":"bind9","ecosystem":"Debian:12","purl":"pkg:deb/debian/bind9?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.49-1~deb12u2"}]}],"versions":["1:9.18.12-1","1:9.18.13-1","1:9.18.16-1","1:9.18.16-1~deb12u1","1:9.18.16-1~deb12u1~bpo11+1","1:9.18.19-1~deb12u1","1:9.18.19-1~deb12u1~bpo11+1","1:9.18.24-1","1:9.18.24-1~bpo11+1","1:9.18.28-1~deb12u1","1:9.18.28-1~deb12u2","1:9.18.33-1~deb12u2","1:9.18.41-1~deb12u1","1:9.18.44-1~deb12u1","1:9.18.47-1~deb12u1","1:9.18.49-1~deb12u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5946.json"}},{"package":{"name":"bind9","ecosystem":"Debian:13","purl":"pkg:deb/debian/bind9?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.23-1~deb13u1"}]}],"versions":["1:9.20.11-4","1:9.20.15-1","1:9.20.15-1~deb13u1","1:9.20.15-1~deb13u1~bpo12+1","1:9.20.15-2","1:9.20.18-1","1:9.20.18-1~deb13u1","1:9.20.18-1~deb13u1~bpo12+1","1:9.20.19-1","1:9.20.19-1~bpo12+1","1:9.20.20-1","1:9.20.20-1~bpo12+1","1:9.20.21-1","1:9.20.21-1~deb13u1","1:9.20.21-1~deb13u1~bpo12+1","1:9.20.22-1","1:9.20.23-1~deb13u1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5946.json"}},{"package":{"name":"bind9","ecosystem":"Debian:14","purl":"pkg:deb/debian/bind9?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.23-1"}]}],"versions":["1:9.20.11-4","1:9.20.15-1","1:9.20.15-1~deb13u1","1:9.20.15-1~deb13u1~bpo12+1","1:9.20.15-2","1:9.20.18-1","1:9.20.18-1~deb13u1","1:9.20.18-1~deb13u1~bpo12+1","1:9.20.19-1","1:9.20.19-1~bpo12+1","1:9.20.20-1","1:9.20.20-1~bpo12+1","1:9.20.21-1","1:9.20.21-1~deb13u1","1:9.20.21-1~deb13u1~bpo12+1","1:9.20.22-1","1:9.20.23-1~deb13u1","1:9.20.23-1~deb13u1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5946.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}