HighFix available
bind9 — security advisory
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
- Products
- bind9
- Affected versions
- 1:9.18.12-1, 1:9.18.13-1, 1:9.18.16-1, 1:9.18.16-1~deb12u1, 1:9.18.16-1~deb12u1~bpo11+1, 1:9.18.19-1~deb12u1, 1:9.18.19-1~deb12u1~bpo11+1, 1:9.18.24-1, 1:9.18.24-1~bpo11+1, 1:9.18.28-1~deb12u1, 1:9.18.28-1~deb12u2, 1:9.18.33-1~deb12u2, 1:9.18.41-1~deb12u1, 1:9.18.44-1~deb12u1, 1:9.18.47-1~deb12u1, 1:9.18.49-1~deb12u1, 1:9.20.11-4, 1:9.20.15-1, 1:9.20.15-1~deb13u1, 1:9.20.15-1~deb13u1~bpo12+1, 1:9.20.15-2, 1:9.20.18-1, 1:9.20.18-1~deb13u1, 1:9.20.18-1~deb13u1~bpo12+1, 1:9.20.19-1, 1:9.20.19-1~bpo12+1, 1:9.20.20-1, 1:9.20.20-1~bpo12+1, 1:9.20.21-1, 1:9.20.21-1~deb13u1, 1:9.20.21-1~deb13u1~bpo12+1, 1:9.20.22-1, 1:9.20.23-1, 1:9.20.23-1~deb13u1, 1:9.20.23-1~deb13u1~bpo12+1, 1:9.20.24-1, 1:9.20.26-1~deb13u1, 1:9.20.26-1~deb13u1~bpo12+1
- Fixed versions
- 1:9.18.49-1~deb12u2, 1:9.20.26-1, 1:9.20.26-1~deb13u1
- CVEs
- CVE-2026-11622
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:56 UTC · Revision 2
Source evidence
A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
osv:DEBIAN-CVE-2026-11622
bind9
Fixed versions: 1:9.18.49-1~deb12u2
bind9
Fixed versions: 1:9.20.26-1~deb13u1
bind9
Fixed versions: 1:9.20.26-1
Complete source record
{
"id": "0d15219dd321beef82d58b096684cd006612e2d0a36d1406287d9e5e734940d1",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-11622",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-11622",
"summary": "A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the limit configured in the `max-cache-size` parameter. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.",
"evidence": "osv:DEBIAN-CVE-2026-11622",
"products": [
{
"name": {
"value": "bind9",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.18.49-1~deb12u2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1:9.18.12-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.13-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1~deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.19-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.19-1~deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.24-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.24-1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.28-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.28-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.33-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.41-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.44-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.47-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.49-1~deb12u1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "bind9",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.20.26-1~deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1:9.20.11-4",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.15-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.15-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.15-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.15-2",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.18-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.18-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.18-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.19-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.19-1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.20-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.20-1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.21-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.21-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.21-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.22-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.23-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.23-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.23-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.24-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.26-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "bind9",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.20.26-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1:9.20.11-4",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.15-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.15-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.15-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.15-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.18-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.18-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.18-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.19-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.19-1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.20-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.20-1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.21-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.21-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.21-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.22-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.23-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.23-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.23-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.24-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.26-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.26-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-11622",
"aliases": [
"DEBIAN-CVE-2026-11622"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.18.49-1~deb12u2"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:9.18.12-1",
"1:9.18.13-1",
"1:9.18.16-1",
"1:9.18.16-1~deb12u1",
"1:9.18.16-1~deb12u1~bpo11+1",
"1:9.18.19-1~deb12u1",
"1:9.18.19-1~deb12u1~bpo11+1",
"1:9.18.24-1",
"1:9.18.24-1~bpo11+1",
"1:9.18.28-1~deb12u1",
"1:9.18.28-1~deb12u2",
"1:9.18.33-1~deb12u2",
"1:9.18.41-1~deb12u1",
"1:9.18.44-1~deb12u1",
"1:9.18.47-1~deb12u1",
"1:9.18.49-1~deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-11622.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.20.26-1~deb13u1"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:9.20.11-4",
"1:9.20.15-1",
"1:9.20.15-1~deb13u1",
"1:9.20.15-1~deb13u1~bpo12+1",
"1:9.20.15-2",
"1:9.20.18-1",
"1:9.20.18-1~deb13u1",
"1:9.20.18-1~deb13u1~bpo12+1",
"1:9.20.19-1",
"1:9.20.19-1~bpo12+1",
"1:9.20.20-1",
"1:9.20.20-1~bpo12+1",
"1:9.20.21-1",
"1:9.20.21-1~deb13u1",
"1:9.20.21-1~deb13u1~bpo12+1",
"1:9.20.22-1",
"1:9.20.23-1",
"1:9.20.23-1~deb13u1",
"1:9.20.23-1~deb13u1~bpo12+1",
"1:9.20.24-1",
"1:9.20.26-1~deb13u1~bpo12+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-11622.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.20.26-1"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1:9.20.11-4",
"1:9.20.15-1",
"1:9.20.15-1~deb13u1",
"1:9.20.15-1~deb13u1~bpo12+1",
"1:9.20.15-2",
"1:9.20.18-1",
"1:9.20.18-1~deb13u1",
"1:9.20.18-1~deb13u1~bpo12+1",
"1:9.20.19-1",
"1:9.20.19-1~bpo12+1",
"1:9.20.20-1",
"1:9.20.20-1~bpo12+1",
"1:9.20.21-1",
"1:9.20.21-1~deb13u1",
"1:9.20.21-1~deb13u1~bpo12+1",
"1:9.20.22-1",
"1:9.20.23-1",
"1:9.20.23-1~deb13u1",
"1:9.20.23-1~deb13u1~bpo12+1",
"1:9.20.24-1",
"1:9.20.26-1~deb13u1",
"1:9.20.26-1~deb13u1~bpo12+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-11622.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-25T09:47:42.651843637Z",
"provider": "osv",
"upstream": [
"CVE-2026-11622"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-11622"
]
},
"related_cves": [
{
"value": "CVE-2026-11622",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 445345,
"published_at": "2026-07-22T15:16:51.703+00:00"
}