UnratedFix available
unbound: Fix of CVE-2026-40622
Type: advisorySources: OSV
- CVE-2026-40622: clamp NS RRset TTL to the cached value in the higher-trust branch of need_to_update_rrset() to prevent the "ghost domain" variant where an attacker-controlled higher-trust NS response revives a revoked delegation.
- Products
- python3-unbound, unbound, unbound-devel, unbound-dracut, unbound-libs
- Affected versions
- Not specified
- Fixed versions
- 1.16.2-19.el9_6.1.tuxcare.els7
- CVEs
- CVE-2026-40622
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:48 UTC · Revision 1
Source evidence
- CVE-2026-40622: clamp NS RRset TTL to the cached value in the higher-trust branch of need_to_update_rrset() to prevent the "ghost domain" variant where an attacker-controlled higher-trust NS response revives a revoked delegation.
osv:CLSA-2026-1780479714
python3-unbound
Fixed versions: 1.16.2-19.el9_6.1.tuxcare.els7
unbound
Fixed versions: 1.16.2-19.el9_6.1.tuxcare.els7
unbound-devel
Fixed versions: 1.16.2-19.el9_6.1.tuxcare.els7
unbound-dracut
Fixed versions: 1.16.2-19.el9_6.1.tuxcare.els7
unbound-libs
Fixed versions: 1.16.2-19.el9_6.1.tuxcare.els7
Complete source record
{
"id": "f8c253425ad21d4e9882c0ee72ef34241dbbf70512dc1a912a9f7b8584cb9997",
"url": "https://osv.dev/vulnerability/CLSA-2026-1780479714",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "unbound: Fix of CVE-2026-40622",
"summary": "- CVE-2026-40622: clamp NS RRset TTL to the cached value in the higher-trust branch of need_to_update_rrset() to prevent the \"ghost domain\" variant where an attacker-controlled higher-trust NS response revives a revoked delegation.",
"evidence": "osv:CLSA-2026-1780479714",
"products": [
{
"name": {
"value": "python3-unbound",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.16.2-19.el9_6.1.tuxcare.els7",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "unbound",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.16.2-19.el9_6.1.tuxcare.els7",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "unbound-devel",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.16.2-19.el9_6.1.tuxcare.els7",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "unbound-dracut",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.16.2-19.el9_6.1.tuxcare.els7",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "unbound-libs",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.16.2-19.el9_6.1.tuxcare.els7",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1780479714",
"aliases": [
"CLSA-2026-1780479714"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.16.2-19.el9_6.1.tuxcare.els7"
}
]
}
],
"package": {
"name": "python3-unbound",
"purl": "pkg:rpm/tuxcare/python3-unbound?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780479714.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.16.2-19.el9_6.1.tuxcare.els7"
}
]
}
],
"package": {
"name": "unbound",
"purl": "pkg:rpm/tuxcare/unbound?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780479714.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.16.2-19.el9_6.1.tuxcare.els7"
}
]
}
],
"package": {
"name": "unbound-devel",
"purl": "pkg:rpm/tuxcare/unbound-devel?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780479714.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.16.2-19.el9_6.1.tuxcare.els7"
}
]
}
],
"package": {
"name": "unbound-dracut",
"purl": "pkg:rpm/tuxcare/unbound-dracut?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780479714.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.16.2-19.el9_6.1.tuxcare.els7"
}
]
}
],
"package": {
"name": "unbound-libs",
"purl": "pkg:rpm/tuxcare/unbound-libs?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1780479714.json"
}
}
],
"modified": "2026-10-26T09:31:05.642653178Z",
"provider": "osv",
"upstream": [
"CVE-2026-40622"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1780479714.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-40622"
]
},
"related_cves": [
{
"value": "CVE-2026-40622",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 447430,
"published_at": "2026-06-03T09:42:06+00:00"
}