Unrated
pdns-recursor — security advisory
[A malicious client can cause too many TCP connections in TIME_WAIT state]
- Products
- pdns-recursor
- Affected versions
- 3.7.3-1, 4.0.0~alpha1-1, 4.0.0~alpha1-2, 4.0.0~alpha2-2, 4.0.0~alpha2-2ubuntu0.1, 4.0.0~alpha2-2ubuntu0.1+esm1, 4.0.6-1, 4.0.6-1build1, 4.0.7-1, 4.1.1-1, 4.1.1-1build1, 4.1.1-2, 4.1.1-2ubuntu0.1~esm1, 4.2.0-6, 4.2.1-1, 4.2.1-1build1, 4.2.1-1build2, 4.2.1-1ubuntu0.1~esm1, 4.4.2-3, 4.6.0-1ubuntu1, 4.6.0-1ubuntu1+esm1, 4.9.0-2, 4.9.1-4, 4.9.2-1, 4.9.2-1build1, 4.9.2-2, 4.9.3-1, 4.9.3-1build2, 4.9.3-1build3, 5.2.4-2build2, 5.3.1-1, 5.3.3-1, 5.3.4-1, 5.3.4-1build1, 5.3.4-2, 5.3.5-1, 5.4.3-1, 5.4.5-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-73205
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 21:11 UTC · Revision 1
Source evidence
[A malicious client can cause too many TCP connections in TIME_WAIT state]
osv:UBUNTU-CVE-2026-73205
pdns-recursor
Fixed versions: Not specified
pdns-recursor
Fixed versions: Not specified
pdns-recursor
Fixed versions: Not specified
pdns-recursor
Fixed versions: Not specified
pdns-recursor
Fixed versions: Not specified
pdns-recursor
Fixed versions: Not specified
pdns-recursor
Fixed versions: Not specified
Complete source record
{
"id": "d7b88367414a0f9d9275339535b87559eee3cd01bb37cf5e9ca1710b181b0238",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-73205",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-73205",
"summary": "[A malicious client can cause too many TCP connections in TIME_WAIT state]",
"evidence": "osv:UBUNTU-CVE-2026-73205",
"products": [
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.7.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.0~alpha1-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.0~alpha1-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.0~alpha2-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.0~alpha2-2ubuntu0.1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.0~alpha2-2ubuntu0.1+esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.0.6-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.6-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "4.0.7-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.1-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.1-2ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.2.0-6",
"evidence": "/affected/2/versions"
},
{
"value": "4.2.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.2.1-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "4.2.1-1build2",
"evidence": "/affected/2/versions"
},
{
"value": "4.2.1-1ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.4.2-3",
"evidence": "/affected/3/versions"
},
{
"value": "4.6.0-1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "4.6.0-1ubuntu1+esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.9.0-2",
"evidence": "/affected/4/versions"
},
{
"value": "4.9.1-4",
"evidence": "/affected/4/versions"
},
{
"value": "4.9.2-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.9.2-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "4.9.2-2",
"evidence": "/affected/4/versions"
},
{
"value": "4.9.3-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.9.3-1build2",
"evidence": "/affected/4/versions"
},
{
"value": "4.9.3-1build3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.3.5-1",
"evidence": "/affected/5/versions"
},
{
"value": "5.4.3-1",
"evidence": "/affected/5/versions"
},
{
"value": "5.4.5-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "pdns-recursor",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.2.4-2build2",
"evidence": "/affected/6/versions"
},
{
"value": "5.3.1-1",
"evidence": "/affected/6/versions"
},
{
"value": "5.3.3-1",
"evidence": "/affected/6/versions"
},
{
"value": "5.3.4-1",
"evidence": "/affected/6/versions"
},
{
"value": "5.3.4-1build1",
"evidence": "/affected/6/versions"
},
{
"value": "5.3.4-2",
"evidence": "/affected/6/versions"
},
{
"value": "5.3.5-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "unknown",
"structured": {
"id": "UBUNTU-CVE-2026-73205",
"aliases": [
"UBUNTU-CVE-2026-73205"
],
"metrics": [
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/ubuntu/pdns-recursor?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"3.7.3-1",
"4.0.0~alpha1-1",
"4.0.0~alpha1-2",
"4.0.0~alpha2-2",
"4.0.0~alpha2-2ubuntu0.1",
"4.0.0~alpha2-2ubuntu0.1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73205.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pdns-recursor",
"binary_version": "4.0.0~alpha2-2ubuntu0.1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/ubuntu/pdns-recursor?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"4.0.6-1",
"4.0.6-1build1",
"4.0.7-1",
"4.1.1-1",
"4.1.1-1build1",
"4.1.1-2",
"4.1.1-2ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73205.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pdns-recursor",
"binary_version": "4.1.1-2ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/ubuntu/pdns-recursor?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"4.2.0-6",
"4.2.1-1",
"4.2.1-1build1",
"4.2.1-1build2",
"4.2.1-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73205.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pdns-recursor",
"binary_version": "4.2.1-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/ubuntu/pdns-recursor?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"4.4.2-3",
"4.6.0-1ubuntu1",
"4.6.0-1ubuntu1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73205.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pdns-recursor",
"binary_version": "4.6.0-1ubuntu1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/ubuntu/pdns-recursor?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"4.9.0-2",
"4.9.1-4",
"4.9.2-1",
"4.9.2-1build1",
"4.9.2-2",
"4.9.3-1",
"4.9.3-1build2",
"4.9.3-1build3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73205.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pdns-recursor",
"binary_version": "4.9.3-1build3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/ubuntu/pdns-recursor?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"5.3.5-1",
"5.4.3-1",
"5.4.5-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73205.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pdns-recursor",
"binary_version": "5.4.5-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pdns-recursor",
"purl": "pkg:deb/ubuntu/pdns-recursor?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"5.2.4-2build2",
"5.3.1-1",
"5.3.3-1",
"5.3.4-1",
"5.3.4-1build1",
"5.3.4-2",
"5.3.5-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73205.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pdns-recursor",
"binary_version": "5.3.5-1"
}
]
}
}
],
"modified": "2026-10-23T10:35:53.167030230Z",
"provider": "osv",
"upstream": [
"CVE-2026-73205"
],
"references": [
"https://ubuntu.com/security/CVE-2026-73205",
"https://www.cve.org/CVERecord?id=CVE-2026-73205",
"https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2026-12.html#cve-2026-73205-a-malicious-client-can-cause-too-many-tcp-connections-in-time-wait-state"
]
},
"related_cves": [
{
"value": "CVE-2026-73205",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 412742,
"published_at": "2026-10-23T00:00:00+00:00"
}