ubuntu-cve-2026-5946
Vulnerability from osv_ubuntu
Published
2026-05-20 00:00
Modified
2026-06-30 16:18
Summary
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.
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
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{
"binary_name": "libdns-export1110",
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{
"binary_name": "libirs-export161",
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},
{
"binary_name": "libirs161",
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{
"binary_name": "libisc-export1105",
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},
{
"binary_name": "libisc1105",
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{
"binary_name": "libisccc-export161",
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},
{
"binary_name": "libisccc161",
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},
{
"binary_name": "libisccfg-export163",
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},
{
"binary_name": "libisccfg163",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "liblwres161",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "bind9-libs",
"purl": "pkg:deb/ubuntu/bind9-libs@1:9.11.19+dfsg-2.1ubuntu3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
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],
"versions": [
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"1:9.11.19+dfsg-2.1ubuntu2",
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},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
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{
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{
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},
{
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},
{
"binary_name": "bind9utils",
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},
{
"binary_name": "dnsutils",
"binary_version": "1:9.18.39-0ubuntu0.24.04.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "bind9",
"purl": "pkg:deb/ubuntu/bind9@1:9.18.39-0ubuntu0.24.04.5?arch=source\u0026distro=noble"
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"ranges": [
{
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"versions": [
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},
{
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"availability": "No subscription required",
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},
"package": {
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{
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{
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"binary_version": "1:9.20.18-1ubuntu2.1"
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{
"binary_name": "bind9-host",
"binary_version": "1:9.20.18-1ubuntu2.1"
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{
"binary_name": "bind9-libs",
"binary_version": "1:9.20.18-1ubuntu2.1"
},
{
"binary_name": "bind9-utils",
"binary_version": "1:9.20.18-1ubuntu2.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "bind9",
"purl": "pkg:deb/ubuntu/bind9@1:9.20.18-1ubuntu2.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:9.20.11-1ubuntu2",
"1:9.20.11-1ubuntu3",
"1:9.20.18-1ubuntu1",
"1:9.20.18-1ubuntu2"
]
}
],
"aliases": [],
"details": "Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) \u2014 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 \u2014 recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data \u2014 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.",
"id": "UBUNTU-CVE-2026-5946",
"modified": "2026-06-30T16:18:37Z",
"published": "2026-05-20T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-5946"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-5946"
},
{
"type": "REPORT",
"url": "https://kb.isc.org/docs/cve-2026-5946"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8293-1"
}
],
"related": [
"USN-8293-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-5946"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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