{"id":"CVE-2026-5950","details":"An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions.\nThis issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.","modified":"2026-05-31T02:56:29.864279Z","published":"2026-05-20T13:16:40.450Z","related":["openSUSE-SU-2026:10874-1"],"references":[{"type":"ADVISORY","url":"https://kb.isc.org/docs/cve-2026-5950"},{"type":"FIX","url":"https://downloads.isc.org/isc/bind9/9.18.49"},{"type":"FIX","url":"https://downloads.isc.org/isc/bind9/9.20.23"},{"type":"FIX","url":"https://downloads.isc.org/isc/bind9/9.21.22"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/isc-projects/bind9","events":[{"introduced":"20451734dd92248cb87778a98dc8d827b766be20"},{"fixed":"cd4a53b4630ba8646b2071ea8161d578b4185a94"},{"introduced":"6400fd6c05506b7c67b9384ac659ba3af553e4ba"},{"fixed":"7d0b4d4d436e7b950225a533e5bc56d8f935cc1c"},{"introduced":"6a06226c0fc2ef665a787290672ed8189a44d8a5"},{"fixed":"ec2e1ce35a5ad648088f4821c9114e739e117c1c"}],"database_specific":{"cpe":"cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*","extracted_events":[{"introduced":"9.18.36"},{"fixed":"9.18.49"},{"introduced":"9.20.8"},{"fixed":"9.20.23"},{"introduced":"9.21.7"},{"fixed":"9.21.21"}],"source":"CPE_RANGE"}}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-5950.json"}},{"ranges":[{"type":"GIT","repo":"https://gitlab.isc.org/isc-projects/bind9","events":[{"introduced":"20451734dd92248cb87778a98dc8d827b766be20"},{"fixed":"cd4a53b4630ba8646b2071ea8161d578b4185a94"},{"introduced":"6400fd6c05506b7c67b9384ac659ba3af553e4ba"},{"fixed":"7d0b4d4d436e7b950225a533e5bc56d8f935cc1c"},{"introduced":"6a06226c0fc2ef665a787290672ed8189a44d8a5"},{"fixed":"ec2e1ce35a5ad648088f4821c9114e739e117c1c"}],"database_specific":{"cpe":"cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*","extracted_events":[{"introduced":"9.18.36"},{"fixed":"9.18.49"},{"introduced":"9.20.8"},{"fixed":"9.20.23"},{"introduced":"9.21.7"},{"fixed":"9.21.21"}],"source":"CPE_RANGE"}}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-5950.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}