{"schemaVersion":3,"id":"CVE-2026-5946","aliases":["ALPINE-CVE-2026-5946","UBUNTU-CVE-2026-5946","DEBIAN-CVE-2026-5946"],"status":"published","duplicateOf":null,"title":null,"description":"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`.\nThis 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.","dates":{"published":"2026-05-20T13:10:03.479Z","modified":"2026-09-17T12:04:38.551Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Alpine","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01696,"percentile":0.76812,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":-0.17800000000000005,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.01874},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01696,"percentile":0.76812}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01874,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01696,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01696,"percentile":0.76812}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-20","name":"Improper Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"},{"id":"CWE-125","name":"Out-of-bounds Read","description":"The product reads data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/125.html"},{"id":"CWE-617","name":"Reachable Assertion","description":"The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/617.html"},{"id":"CWE-754","name":"Improper Check for Unusual or Exceptional Conditions","description":"The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/754.html"},{"id":"CWE-843","name":"Access of Resource Using Incompatible Type ('Type Confusion')","description":"The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/843.html"},{"id":"CWE-1287","name":"Improper Validation of Specified Type of Input","description":"The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/1287.html"}],"affected":[{"vendor":"alpine","product":"bind","name":"bind","label":"bind","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/bind","purlType":"apk","versions":[{"text":"≥ 9.11.0, < 9.18.49-r0","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.11.0, < 9.20.23-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 9.11.0, < 9.18.49-r0 | ≥ 9.11.0, < 9.20.23-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"bind9","name":"bind9","label":"bind9","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/bind9","purlType":"deb","versions":[{"text":"< 1:9.18.49-1~deb12u2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:9.20.23-1~deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:9.20.23-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:9.18.49-1~deb12u2 | < 1:9.20.23-1~deb13u1 | < 1:9.20.23-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"bind9","name":"bind9","label":"bind9","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/bind9","purlType":"deb","versions":[{"text":"< 1:9.11.3+dfsg-1ubuntu1.19+esm5","noFixRecorded":false,"fixedIn":null},{"text":"< 1:9.18.30-0ubuntu0.20.04.2+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:9.18.39-0ubuntu0.22.04.4","noFixRecorded":false,"fixedIn":null},{"text":"< 1:9.18.39-0ubuntu0.24.04.5","noFixRecorded":false,"fixedIn":null},{"text":"< 1:9.20.11-1ubuntu2.4","noFixRecorded":false,"fixedIn":null},{"text":"< 1:9.20.18-1ubuntu2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:9.11.3+dfsg-1ubuntu1.19+esm5 | < 1:9.18.30-0ubuntu0.20.04.2+esm2 | < 1:9.18.39-0ubuntu0.22.04.4 | < 1:9.18.39-0ubuntu0.24.04.5 | < 1:9.20.11-1ubuntu2.4 | < 1:9.20.18-1ubuntu2.1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"bind9-libs","name":"bind9-libs","label":"bind9-libs","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/bind9-libs","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"isc","product":"bind","name":"BIND","label":"bind","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 9.11.0, ≤ 9.16.50","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.18.0, < 9.18.49","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.20.0, < 9.20.23","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.21.0, < 9.21.22","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 9.11.0, ≤ 9.16.50 | ≥ 9.18.0, < 9.18.49 | ≥ 9.20.0, < 9.20.23 | ≥ 9.21.0, < 9.21.22","eol":null,"hubHref":"/vendor/isc/bind"},{"vendor":"isc","product":"bind 9","name":"BIND 9","label":"bind 9","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 9.11.0, ≤ 9.16.50","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.18.0, ≤ 9.18.48","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.20.0, ≤ 9.20.22","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.21.0, ≤ 9.21.21","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.11.3-S1, ≤ 9.16.50-S1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.18.11-S1, ≤ 9.18.48-S1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.20.9-S1, ≤ 9.20.22-S1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 9.11.0, ≤ 9.16.50 | ≥ 9.18.0, ≤ 9.18.48 | ≥ 9.20.0, ≤ 9.20.22 | ≥ 9.21.0, ≤ 9.21.21 | ≥ 9.11.3-S1, ≤ 9.16.50-S1 | ≥ 9.18.11-S1, ≤ 9.18.48-S1 | ≥ 9.20.9-S1, ≤ 9.20.22-S1","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"bind-9","label":"BIND 9","category":"server-app"}},"hubHref":"/vendor/isc/bind_9"}],"affectedCount":6,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://kb.isc.org/docs/cve-2026-5946","label":"kb.isc.org/docs/cve-2026-5946","hostname":"kb.isc.org","tags":["Vendor Advisory","REPORT"]},{"url":"https://downloads.isc.org/isc/bind9/9.18.49","label":"downloads.isc.org/isc/bind9/9.18.49","hostname":"downloads.isc.org","tags":["Patch"]},{"url":"https://downloads.isc.org/isc/bind9/9.20.23","label":"downloads.isc.org/isc/bind9/9.20.23","hostname":"downloads.isc.org","tags":["Patch"]},{"url":"https://downloads.isc.org/isc/bind9/9.21.22","label":"downloads.isc.org/isc/bind9/9.21.22","hostname":"downloads.isc.org","tags":["Patch"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-5946","label":"access.redhat.com/security/cve/CVE-2026-5946","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479771","label":"bugzilla.redhat.com/show_bug.cgi?id=2479771","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5946.json","label":"security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5946.json","hostname":"security.access.redhat.com","tags":["X Sadp Csaf Vex"]},{"url":"https://access.redhat.com/errata/RHSA-2026:60383","label":"access.redhat.com/errata/RHSA-2026:60383","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:62549","label":"access.redhat.com/errata/RHSA-2026:62549","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:65851","label":"access.redhat.com/errata/RHSA-2026:65851","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24338","label":"access.redhat.com/errata/RHSA-2026:24338","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24339","label":"access.redhat.com/errata/RHSA-2026:24339","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:23360","label":"access.redhat.com/errata/RHSA-2026:23360","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:57189","label":"access.redhat.com/errata/RHSA-2026:57189","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:55441","label":"access.redhat.com/errata/RHSA-2026:55441","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24367","label":"access.redhat.com/errata/RHSA-2026:24367","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24368","label":"access.redhat.com/errata/RHSA-2026:24368","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20334","label":"access.redhat.com/errata/RHSA-2026:20334","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-5946","label":"security.alpinelinux.org/vuln/CVE-2026-5946","hostname":"security.alpinelinux.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-5946","label":"ubuntu.com/security/CVE-2026-5946","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-5946","label":"www.cve.org/CVERecord?id=CVE-2026-5946","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8293-1","label":"ubuntu.com/security/notices/USN-8293-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/notices/USN-8682-1","label":"ubuntu.com/security/notices/USN-8682-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-5946","label":"security-tracker.debian.org/tracker/CVE-2026-5946","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5946","label":"nvd.nist.gov/vuln/detail/CVE-2026-5946","hostname":"nvd.nist.gov","tags":["Oval","Advisory"]}],"lineage":{"upstream":[],"downstream":["MGASA-2026-0163","OPENSUSE-SU-2026:10874-1","OPENSUSE-SU-2026:21123-1","RHSA-2026:20334","RHSA-2026:23360","RHSA-2026:24338","RHSA-2026:24339","RHSA-2026:24367","RHSA-2026:24368","RHSA-2026:55441","RHSA-2026:57189","RHSA-2026:60383","RHSA-2026:79160","SUSE-SU-2026:22198-1","SUSE-SU-2026:2616-1","SUSE-SU-2026:2617-1","SUSE-SU-2026:2673-1","SUSE-SU-2026:2676-1","SUSE-SU-2026:2779-1","SUSE-SU-2026:3517-1","USN-8682-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:10874-1","OPENSUSE-SU-2026:21123-1","SUSE-SU-2026:22198-1","SUSE-SU-2026:2616-1","SUSE-SU-2026:2617-1","SUSE-SU-2026:2673-1","SUSE-SU-2026:2676-1","SUSE-SU-2026:2779-1","SUSE-SU-2026:3517-1","USN-8293-1","USN-8682-1"]},"timeline":[{"kind":"published","date":"2026-05-20T13:10:03.479Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-17T12:04:38.551Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T03:03:35.153Z","stale":false,"partial":false}}