HighFix available
unbound — security advisory
A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.
- 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, 1.13.1-1ubuntu5.2, 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, 1.22.0-1ubuntu1, 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, 1.4.22-1ubuntu4.14.04.3+esm4, 1.4.22-1ubuntu4.14.04.3+esm5, 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, 1.5.8-1ubuntu1.1+esm4, 1.5.8-1ubuntu1.1+esm5, 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, 1.6.7-1ubuntu2.6+esm5, 1.6.7-1ubuntu2.6+esm6, 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, 1.9.4-2ubuntu1.11+esm2, 1.9.4-2ubuntu1.11+esm3, 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
- 1.13.1-1ubuntu5.11, 1.19.2-1ubuntu3.5, 1.22.0-2ubuntu1
- CVEs
- CVE-2025-5994
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 14:34 UTC · Revision 1
Source evidence
A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.
osv:UBUNTU-CVE-2025-5994
unbound
Fixed versions: Not specified
unbound
Fixed versions: Not specified
unbound
Fixed versions: Not specified
unbound
Fixed versions: Not specified
unbound
Fixed versions: 1.13.1-1ubuntu5.11
unbound
Fixed versions: 1.19.2-1ubuntu3.5
unbound
Fixed versions: 1.22.0-2ubuntu1
Complete source record
{
"id": "cd637d31556149725ee8cc20c9ad1814506d5f268dea6ed5cce3602982122feb",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-5994",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-5994",
"summary": "A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.",
"evidence": "osv:UBUNTU-CVE-2025-5994",
"products": [
{
"name": {
"value": "unbound",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"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"
},
{
"value": "1.4.22-1ubuntu4.14.04.3+esm4",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.22-1ubuntu4.14.04.3+esm5",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"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"
},
{
"value": "1.5.8-1ubuntu1.1+esm4",
"evidence": "/affected/1/versions"
},
{
"value": "1.5.8-1ubuntu1.1+esm5",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"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"
},
{
"value": "1.6.7-1ubuntu2.6+esm5",
"evidence": "/affected/2/versions"
},
{
"value": "1.6.7-1ubuntu2.6+esm6",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"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"
},
{
"value": "1.9.4-2ubuntu1.11+esm2",
"evidence": "/affected/3/versions"
},
{
"value": "1.9.4-2ubuntu1.11+esm3",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.13.1-1ubuntu5.11",
"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"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.19.2-1ubuntu3.5",
"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"
}
]
},
{
"name": {
"value": "unbound",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.22.0-2ubuntu1",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "1.22.0-1ubuntu1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2025-5994",
"aliases": [
"UBUNTU-CVE-2025-5994"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/R:U/V:C"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"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",
"1.4.22-1ubuntu4.14.04.3+esm4",
"1.4.22-1ubuntu4.14.04.3+esm5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-5994.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound2",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm5"
},
{
"binary_name": "python-unbound",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm5"
},
{
"binary_name": "unbound",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm5"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm5"
},
{
"binary_name": "unbound-host",
"binary_version": "1.4.22-1ubuntu4.14.04.3+esm5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"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",
"1.5.8-1ubuntu1.1+esm4",
"1.5.8-1ubuntu1.1+esm5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-5994.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound2",
"binary_version": "1.5.8-1ubuntu1.1+esm5"
},
{
"binary_name": "python-unbound",
"binary_version": "1.5.8-1ubuntu1.1+esm5"
},
{
"binary_name": "unbound",
"binary_version": "1.5.8-1ubuntu1.1+esm5"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.5.8-1ubuntu1.1+esm5"
},
{
"binary_name": "unbound-host",
"binary_version": "1.5.8-1ubuntu1.1+esm5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"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",
"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",
"1.6.7-1ubuntu2.6+esm5",
"1.6.7-1ubuntu2.6+esm6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-5994.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound2",
"binary_version": "1.6.7-1ubuntu2.6+esm6"
},
{
"binary_name": "python-unbound",
"binary_version": "1.6.7-1ubuntu2.6+esm6"
},
{
"binary_name": "python3-unbound",
"binary_version": "1.6.7-1ubuntu2.6+esm6"
},
{
"binary_name": "unbound",
"binary_version": "1.6.7-1ubuntu2.6+esm6"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.6.7-1ubuntu2.6+esm6"
},
{
"binary_name": "unbound-host",
"binary_version": "1.6.7-1ubuntu2.6+esm6"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1.9.0-2ubuntu1",
"1.9.0-2ubuntu2",
"1.9.4-2",
"1.9.4-2ubuntu1",
"1.9.4-2ubuntu1.1",
"1.9.4-2ubuntu1.2",
"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",
"1.9.4-2ubuntu1.11",
"1.9.4-2ubuntu1.11+esm1",
"1.9.4-2ubuntu1.11+esm2",
"1.9.4-2ubuntu1.11+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-5994.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound8",
"binary_version": "1.9.4-2ubuntu1.11+esm3"
},
{
"binary_name": "python-unbound",
"binary_version": "1.9.4-2ubuntu1.11+esm3"
},
{
"binary_name": "python3-unbound",
"binary_version": "1.9.4-2ubuntu1.11+esm3"
},
{
"binary_name": "unbound",
"binary_version": "1.9.4-2ubuntu1.11+esm3"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.9.4-2ubuntu1.11+esm3"
},
{
"binary_name": "unbound-host",
"binary_version": "1.9.4-2ubuntu1.11+esm3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.13.1-1ubuntu5.11"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1.13.1-1ubuntu1",
"1.13.1-1ubuntu3",
"1.13.1-1ubuntu5",
"1.13.1-1ubuntu5.1",
"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",
"1.13.1-1ubuntu5.10"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-5994.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound8",
"binary_version": "1.13.1-1ubuntu5.11"
},
{
"binary_name": "python3-unbound",
"binary_version": "1.13.1-1ubuntu5.11"
},
{
"binary_name": "unbound",
"binary_version": "1.13.1-1ubuntu5.11"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.13.1-1ubuntu5.11"
},
{
"binary_name": "unbound-host",
"binary_version": "1.13.1-1ubuntu5.11"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.19.2-1ubuntu3.5"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-5994.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound8",
"binary_version": "1.19.2-1ubuntu3.5"
},
{
"binary_name": "python3-unbound",
"binary_version": "1.19.2-1ubuntu3.5"
},
{
"binary_name": "unbound",
"binary_version": "1.19.2-1ubuntu3.5"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.19.2-1ubuntu3.5"
},
{
"binary_name": "unbound-host",
"binary_version": "1.19.2-1ubuntu3.5"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.0-2ubuntu1"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:deb/ubuntu/unbound?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"1.22.0-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-5994.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libunbound8",
"binary_version": "1.22.0-2ubuntu1"
},
{
"binary_name": "python3-unbound",
"binary_version": "1.22.0-2ubuntu1"
},
{
"binary_name": "unbound",
"binary_version": "1.22.0-2ubuntu1"
},
{
"binary_name": "unbound-anchor",
"binary_version": "1.22.0-2ubuntu1"
},
{
"binary_name": "unbound-host",
"binary_version": "1.22.0-2ubuntu1"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-21T16:30:14.919618560Z",
"provider": "osv",
"upstream": [
"CVE-2025-5994"
],
"references": [
"https://ubuntu.com/security/CVE-2025-5994",
"https://www.cve.org/CVERecord?id=CVE-2025-5994",
"https://nlnetlabs.nl/downloads/unbound/CVE-2025-5994.txt",
"https://ubuntu.com/security/notices/USN-7666-1"
]
},
"related_cves": [
{
"value": "CVE-2025-5994",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 394506,
"published_at": "2025-07-17T00:00:00+00:00"
}