CriticalFix available
unbound — security advisory
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.
- Products
- unbound
- Affected versions
- 1.13.1-1ubuntu1, 1.13.1-1ubuntu3, 1.13.1-1ubuntu5, 1.13.1-1ubuntu5.1, 1.13.1-1ubuntu5.10, 1.13.1-1ubuntu5.11, 1.13.1-1ubuntu5.12, 1.13.1-1ubuntu5.13, 1.13.1-1ubuntu5.14, 1.13.1-1ubuntu5.15, 1.13.1-1ubuntu5.2, 1.13.1-1ubuntu5.3, 1.13.1-1ubuntu5.4, 1.13.1-1ubuntu5.5, 1.13.1-1ubuntu5.7, 1.13.1-1ubuntu5.8, 1.17.1-2, 1.18.0-2ubuntu1, 1.18.0-2ubuntu2, 1.19.1-1ubuntu1, 1.19.2-1ubuntu1, 1.19.2-1ubuntu3, 1.19.2-1ubuntu3.1, 1.19.2-1ubuntu3.2, 1.19.2-1ubuntu3.3, 1.19.2-1ubuntu3.4, 1.19.2-1ubuntu3.5, 1.19.2-1ubuntu3.6, 1.19.2-1ubuntu3.7, 1.19.2-1ubuntu3.8, 1.19.2-1ubuntu3.9, 1.22.0-2ubuntu2, 1.22.0-2ubuntu4, 1.24.2-1ubuntu1, 1.24.2-1ubuntu2, 1.24.2-1ubuntu2.1, 1.24.2-1ubuntu2.2, 1.25.1-1ubuntu1, 1.25.1-1ubuntu3, 1.4.20-1, 1.4.21-1, 1.4.21-1ubuntu1, 1.4.21-1ubuntu2, 1.4.22-1ubuntu1, 1.4.22-1ubuntu2, 1.4.22-1ubuntu3, 1.4.22-1ubuntu4, 1.4.22-1ubuntu4.14.04.1, 1.4.22-1ubuntu4.14.04.2, 1.4.22-1ubuntu4.14.04.3, 1.4.22-1ubuntu4.14.04.3+esm1, 1.4.22-1ubuntu4.14.04.3+esm2, 1.4.22-1ubuntu4.14.04.3+esm3, 1.4.22-1ubuntu6, 1.5.7-1ubuntu1, 1.5.7-1ubuntu2, 1.5.8-1ubuntu1, 1.5.8-1ubuntu1.1, 1.5.8-1ubuntu1.1+esm1, 1.5.8-1ubuntu1.1+esm2, 1.5.8-1ubuntu1.1+esm3, 1.6.5-1, 1.6.7-1, 1.6.7-1build1, 1.6.7-1ubuntu1, 1.6.7-1ubuntu2, 1.6.7-1ubuntu2.1, 1.6.7-1ubuntu2.2, 1.6.7-1ubuntu2.3, 1.6.7-1ubuntu2.4, 1.6.7-1ubuntu2.5, 1.6.7-1ubuntu2.6, 1.6.7-1ubuntu2.6+esm2, 1.6.7-1ubuntu2.6+esm3, 1.6.7-1ubuntu2.6+esm4, 1.9.0-2ubuntu1, 1.9.0-2ubuntu2, 1.9.4-2, 1.9.4-2ubuntu1, 1.9.4-2ubuntu1.1, 1.9.4-2ubuntu1.11, 1.9.4-2ubuntu1.11+esm1, 1.9.4-2ubuntu1.2, 1.9.4-2ubuntu1.3, 1.9.4-2ubuntu1.4, 1.9.4-2ubuntu1.5, 1.9.4-2ubuntu1.6, 1.9.4-2ubuntu1.8, 1.9.4-2ubuntu1.9
- Fixed versions
- 1.13.1-1ubuntu5.16, 1.19.2-1ubuntu3.10, 1.24.2-1ubuntu2.3, 1.4.22-1ubuntu4.14.04.3+esm4, 1.5.8-1ubuntu1.1+esm4, 1.6.7-1ubuntu2.6+esm5, 1.9.4-2ubuntu1.11+esm2
- CVEs
- CVE-2026-81642
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:20 UTC · Revision 1
Source evidence
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.
osv:UBUNTU-CVE-2026-81642
unbound
Fixed versions: 1.4.22-1ubuntu4.14.04.3+esm4
unbound
Fixed versions: 1.5.8-1ubuntu1.1+esm4
unbound
Fixed versions: 1.6.7-1ubuntu2.6+esm5
unbound
Fixed versions: 1.9.4-2ubuntu1.11+esm2
unbound
Fixed versions: 1.13.1-1ubuntu5.16
unbound
Fixed versions: 1.19.2-1ubuntu3.10
unbound
Fixed versions: Not specified
unbound
Fixed versions: 1.24.2-1ubuntu2.3
Complete source record
{
"id": "be9fa13a21c93f803999087c7ae5dfe67e696fbe215f54812ff571a4ada47188",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-81642",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-81642",
"summary": "In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.",
"evidence": "osv:UBUNTU-CVE-2026-81642",
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},
{
"name": {
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{
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{
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{
"value": "1.6.7-1",
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{
"value": "1.6.7-1build1",
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{
"value": "1.6.7-1ubuntu1",
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{
"value": "1.6.7-1ubuntu2",
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"value": "1.6.7-1ubuntu2.1",
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{
"value": "1.6.7-1ubuntu2.2",
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{
"value": "1.6.7-1ubuntu2.3",
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{
"value": "1.6.7-1ubuntu2.4",
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{
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{
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{
"value": "1.9.0-2ubuntu2",
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{
"value": "1.9.4-2",
"evidence": "/affected/3/versions"
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{
"value": "1.9.4-2ubuntu1",
"evidence": "/affected/3/versions"
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{
"value": "1.9.4-2ubuntu1.1",
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{
"value": "1.9.4-2ubuntu1.2",
"evidence": "/affected/3/versions"
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{
"value": "1.9.4-2ubuntu1.3",
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{
"value": "1.9.4-2ubuntu1.4",
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{
"value": "1.9.4-2ubuntu1.5",
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{
"value": "1.9.4-2ubuntu1.6",
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{
"value": "1.9.4-2ubuntu1.8",
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{
"value": "1.9.4-2ubuntu1.9",
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{
"value": "1.9.4-2ubuntu1.11",
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{
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{
"name": {
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{
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{
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{
"value": "1.13.1-1ubuntu3",
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{
"value": "1.13.1-1ubuntu5",
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{
"value": "1.13.1-1ubuntu5.1",
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{
"value": "1.13.1-1ubuntu5.2",
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{
"value": "1.13.1-1ubuntu5.3",
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"value": "1.13.1-1ubuntu5.4",
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{
"value": "1.13.1-1ubuntu5.5",
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{
"value": "1.13.1-1ubuntu5.7",
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"value": "1.13.1-1ubuntu5.8",
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"value": "1.13.1-1ubuntu5.10",
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"value": "1.13.1-1ubuntu5.11",
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{
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{
"value": "1.13.1-1ubuntu5.13",
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{
"value": "1.13.1-1ubuntu5.14",
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{
"value": "1.13.1-1ubuntu5.15",
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"name": {
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{
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],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-81642",
"aliases": [
"UBUNTU-CVE-2026-81642"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Red"
},
{
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},
{
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"score": "medium"
}
],
"affected": [
{
"ranges": [
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"events": [
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{
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}
]
}
],
"package": {
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},
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"1.4.22-1ubuntu4.14.04.3+esm2",
"1.4.22-1ubuntu4.14.04.3+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-81642.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
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},
{
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},
{
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},
{
"binary_name": "unbound-host",
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}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
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]
}
],
"package": {
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},
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],
"database_specific": {
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},
"ecosystem_specific": {
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{
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},
{
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},
{
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},
{
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},
{
"binary_name": "unbound-host",
"binary_version": "1.5.8-1ubuntu1.1+esm4"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
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"1.6.7-1",
"1.6.7-1build1",
"1.6.7-1ubuntu1",
"1.6.7-1ubuntu2",
"1.6.7-1ubuntu2.1",
"1.6.7-1ubuntu2.2",
"1.6.7-1ubuntu2.3",
"1.6.7-1ubuntu2.4",
"1.6.7-1ubuntu2.5",
"1.6.7-1ubuntu2.6",
"1.6.7-1ubuntu2.6+esm2",
"1.6.7-1ubuntu2.6+esm3",
"1.6.7-1ubuntu2.6+esm4"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound2",
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},
{
"binary_name": "python-unbound",
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},
{
"binary_name": "python3-unbound",
"binary_version": "1.6.7-1ubuntu2.6+esm5"
},
{
"binary_name": "unbound",
"binary_version": "1.6.7-1ubuntu2.6+esm5"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.6.7-1ubuntu2.6+esm5"
},
{
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],
"modified": "2026-10-17T13:01:11.033069155Z",
"provider": "osv",
"upstream": [
"CVE-2026-81642"
],
"references": [
"https://ubuntu.com/security/CVE-2026-81642",
"https://www.cve.org/CVERecord?id=CVE-2026-81642",
"https://nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt",
"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt",
"https://ubuntu.com/security/notices/USN-8873-1"
]
},
"related_cves": [
{
"value": "CVE-2026-81642",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 361156,
"published_at": "2026-09-16T09:17:00+00:00"
}