Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-5946
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:35 UTC · Revision 1
Source evidence
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.
osv:CVE-2026-5946
Complete source record
{
"id": "9353e52ef629f70de92cc1e54195676188483032ba5b62cf8cf4b261edbfa598",
"url": "https://osv.dev/vulnerability/CVE-2026-5946",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-5946",
"summary": "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.",
"evidence": "osv:CVE-2026-5946",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-5946",
"aliases": [
"CVE-2026-5946"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/isc-projects/bind9",
"type": "GIT",
"events": [
{
"introduced": "1477c19dd9a347ee19a42dac227f299a4680506f"
},
{
"last_affected": "acf2ba4a9337bced7e666b0460db4f58a4611eb8"
},
{
"introduced": "8db45afa1affcb823e68afdeddedf93e136f5d3e"
},
{
"fixed": "cd4a53b4630ba8646b2071ea8161d578b4185a94"
},
{
"introduced": "14bbdfc7b9db0870a0b8941ca8812d9983fdba1a"
},
{
"fixed": "7d0b4d4d436e7b950225a533e5bc56d8f935cc1c"
},
{
"introduced": "b732da695eecc0526950e2c722cde0bf23e5a070"
},
{
"fixed": "02a7b2c8a549b79cf885d1a0cda28b74de22d197"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.11.0"
},
{
"last_affected": "9.16.50"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.18.0"
},
{
"fixed": "9.18.49"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.20.0"
},
{
"fixed": "9.20.23"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.21.0"
},
{
"fixed": "9.21.22"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v9.18.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5946.json"
}
},
{
"ranges": [
{
"repo": "https://gitlab.isc.org/isc-projects/bind9",
"type": "GIT",
"events": [
{
"introduced": "1477c19dd9a347ee19a42dac227f299a4680506f"
},
{
"last_affected": "acf2ba4a9337bced7e666b0460db4f58a4611eb8"
},
{
"introduced": "8db45afa1affcb823e68afdeddedf93e136f5d3e"
},
{
"fixed": "cd4a53b4630ba8646b2071ea8161d578b4185a94"
},
{
"introduced": "14bbdfc7b9db0870a0b8941ca8812d9983fdba1a"
},
{
"fixed": "7d0b4d4d436e7b950225a533e5bc56d8f935cc1c"
},
{
"introduced": "b732da695eecc0526950e2c722cde0bf23e5a070"
},
{
"fixed": "02a7b2c8a549b79cf885d1a0cda28b74de22d197"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.11.0"
},
{
"last_affected": "9.16.50"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.18.0"
},
{
"fixed": "9.18.49"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.20.0"
},
{
"fixed": "9.20.23"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "9.21.0"
},
{
"fixed": "9.21.22"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v9.18.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5946.json"
}
}
],
"modified": "2026-10-24T10:30:41.622174118Z",
"provider": "osv",
"references": [
"https://access.redhat.com/security/cve/CVE-2026-5946",
"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5946.json",
"https://access.redhat.com/errata/RHSA-2026:20334",
"https://access.redhat.com/errata/RHSA-2026:23360",
"https://access.redhat.com/errata/RHSA-2026:24338",
"https://access.redhat.com/errata/RHSA-2026:24339",
"https://access.redhat.com/errata/RHSA-2026:24367",
"https://access.redhat.com/errata/RHSA-2026:24368",
"https://access.redhat.com/errata/RHSA-2026:55441",
"https://access.redhat.com/errata/RHSA-2026:57189",
"https://access.redhat.com/errata/RHSA-2026:60383",
"https://access.redhat.com/errata/RHSA-2026:62549",
"https://access.redhat.com/errata/RHSA-2026:65851",
"https://kb.isc.org/docs/cve-2026-5946",
"https://bugzilla.redhat.com/show_bug.cgi?id=2479771",
"https://downloads.isc.org/isc/bind9/9.18.49",
"https://downloads.isc.org/isc/bind9/9.20.23",
"https://downloads.isc.org/isc/bind9/9.21.22"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2026-5946",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 435182,
"published_at": "2026-05-20T13:16:40.157+00:00"
}