UnratedFix available
unbound vulnerabilities
Type: advisorySources: OSV
Yuqi Qiu and Xiang Li discovered that Unbound did not correctly handle certain memory operations. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-81642) Ben Morris discovered that Unbound did not correctly handle certain memory operations. An attacker could possibly use this issue to cause a denial of service or execute arbitary code. (CVE-2026-82717)
- 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, 1.4.20-1, 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, CVE-2026-82717
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 27 Oct 2026, 10:43 UTC · Revision 1
Source evidence
Yuqi Qiu and Xiang Li discovered that Unbound did not correctly handle certain memory operations. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-81642) Ben Morris discovered that Unbound did not correctly handle certain memory operations. An attacker could possibly use this issue to cause a denial of service or execute arbitary code. (CVE-2026-82717)
osv:USN-8873-1
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: 1.24.2-1ubuntu2.3
Complete source record
{
"id": "e2dfb16d6431b7ee2be05591f5d8bf7da1ace4533cf338b8f1d04d14af2041a5",
"url": "https://osv.dev/vulnerability/USN-8873-1",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "unbound vulnerabilities",
"summary": "Yuqi Qiu and Xiang Li discovered that Unbound did not correctly handle certain memory operations. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-81642) Ben Morris discovered that Unbound did not correctly handle certain memory operations. An attacker could possibly use this issue to cause a denial of service or execute arbitary code. (CVE-2026-82717)",
"evidence": "osv:USN-8873-1",
"products": [
{
"name": {
"value": "unbound",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.4.22-1ubuntu4.14.04.3+esm4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1.4.20-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.21-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.21-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.21-1ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu3",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu4",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu4.14.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu4.14.04.2",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu4.14.04.3",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu4.14.04.3+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu4.14.04.3+esm2",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu4.14.04.3+esm3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.5.8-1ubuntu1.1+esm4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1.4.22-1ubuntu6",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.7-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.7-1ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.8-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.8-1ubuntu1.1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.8-1ubuntu1.1+esm1",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.8-1ubuntu1.1+esm2",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.8-1ubuntu1.1+esm3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.6.7-1ubuntu2.6+esm5",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1.6.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.1",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.2",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.3",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.4",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.5",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.6",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.6+esm2",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.6+esm3",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.6+esm4",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.9.4-2ubuntu1.11+esm2",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "1.9.0-2ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.0-2ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.1",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.2",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.3",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.4",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.5",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.6",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.8",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.9",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.11",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.11+esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.13.1-1ubuntu5.16",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": [
{
"value": "1.13.1-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu3",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.1",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.2",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.3",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.4",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.5",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.7",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.8",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.10",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.11",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.12",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.13",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.14",
"evidence": "/affected/4/versions"
},
{
"value": "1.13.1-1ubuntu5.15",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.19.2-1ubuntu3.10",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "1.17.1-2",
"evidence": "/affected/5/versions"
},
{
"value": "1.18.0-2ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "1.18.0-2ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.1-1ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.1",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.2",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.3",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.4",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.5",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.6",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.7",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.8",
"evidence": "/affected/5/versions"
},
{
"value": "1.19.2-1ubuntu3.9",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.24.2-1ubuntu2.3",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "1.22.0-2ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "1.22.0-2ubuntu4",
"evidence": "/affected/6/versions"
},
{
"value": "1.24.2-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "1.24.2-1ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "1.24.2-1ubuntu2.1",
"evidence": "/affected/6/versions"
},
{
"value": "1.24.2-1ubuntu2.2",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "unknown",
"structured": {
"id": "USN-8873-1",
"aliases": [
"USN-8873-1"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.4.22-1ubuntu4.14.04.3+esm4"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8873-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-81642",
"severity": [
{
"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"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-82717",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:14.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound2",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm4"
},
{
"binary_name": "python-unbound",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm4"
},
{
"binary_name": "unbound",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm4"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm4"
},
{
"binary_name": "unbound-host",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm4"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.8-1ubuntu1.1+esm4"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8873-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-81642",
"severity": [
{
"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"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-82717",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound2",
"binary_version": "1.5.8-1ubuntu1.1+esm4"
},
{
"binary_name": "python-unbound",
"binary_version": "1.5.8-1ubuntu1.1+esm4"
},
{
"binary_name": "unbound",
"binary_version": "1.5.8-1ubuntu1.1+esm4"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.5.8-1ubuntu1.1+esm4"
},
{
"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"
},
{
"fixed": "1.6.7-1ubuntu2.6+esm5"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.6.5-1",
"1.6.7-1",
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