{"id":"CVE-2023-4236","details":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","modified":"2026-04-02T09:21:28.999182Z","published":"2023-09-20T13:15:12.313Z","related":["MGASA-2023-0303","openSUSE-SU-2024:13249-1"],"references":[{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20231013-0004/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2023/dsa-5504"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2023/09/20/2"},{"type":"ADVISORY","url":"https://kb.isc.org/docs/cve-2023-4236"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSK5V4W4OHPM3JTJGWAQD6CZW7SFD75B/"},{"type":"ARTICLE","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IPJLLTJCSDJJII7IIZPLTBQNWP7MZH7F/"},{"type":"ARTICLE","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U35OARLQCPMVCBBPHWBXY5M6XJLD2TZ5/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.isc.org/isc-projects/bind9","events":[{"introduced":"8db45afa1affcb823e68afdeddedf93e136f5d3e"},{"fixed":"1f8de2f0aa6a47e299fbd8e66921fbcb4c5f64dc"}],"database_specific":{"versions":[{"introduced":"9.18.0"},{"fixed":"9.18.18"}]}}],"versions":["v9.18.0","v9.18.1","v9.18.10","v9.18.11","v9.18.12","v9.18.13","v9.18.14","v9.18.15","v9.18.16","v9.18.17","v9.18.2","v9.18.3","v9.18.4","v9.18.5","v9.18.6","v9.18.7","v9.18.8","v9.18.9"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4236.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"9.18.11-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"9.18.18-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"37"}]},{"events":[{"introduced":"0"},{"last_affected":"38"}]},{"events":[{"introduced":"0"},{"last_affected":"39"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]},{"events":[{"introduced":"0"},{"last_affected":"11.0"}]}]}}],"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:H"}]}