UnratedFix available
gnutls: Fix of CVE-2026-3833
Type: advisorySources: OSV
- CVE-2026-3833: fix case-sensitive DNS name comparison in x509 name constraints processing that allowed case-variant domain names to bypass excluded constraints, by using c_strncasecmp for case-insensitive match
- Products
- gnutls, gnutls-c++, gnutls-dane, gnutls-devel, gnutls-utils
- Affected versions
- Not specified
- Fixed versions
- 3.8.3-9.el9_6.tuxcare.1.els5
- CVEs
- CVE-2026-3833
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:49 UTC · Revision 1
Source evidence
- CVE-2026-3833: fix case-sensitive DNS name comparison in x509 name constraints processing that allowed case-variant domain names to bypass excluded constraints, by using c_strncasecmp for case-insensitive match
osv:CLSA-2026-1779827686
gnutls
Fixed versions: 3.8.3-9.el9_6.tuxcare.1.els5
gnutls-c++
Fixed versions: 3.8.3-9.el9_6.tuxcare.1.els5
gnutls-dane
Fixed versions: 3.8.3-9.el9_6.tuxcare.1.els5
gnutls-devel
Fixed versions: 3.8.3-9.el9_6.tuxcare.1.els5
gnutls-utils
Fixed versions: 3.8.3-9.el9_6.tuxcare.1.els5
Complete source record
{
"id": "1447aa5f846962e65cd466528a4809f0096a8e183a0847c4180546e4d1ae5b50",
"url": "https://osv.dev/vulnerability/CLSA-2026-1779827686",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "gnutls: Fix of CVE-2026-3833",
"summary": "- CVE-2026-3833: fix case-sensitive DNS name comparison in x509 name constraints processing that allowed case-variant domain names to bypass excluded constraints, by using c_strncasecmp for case-insensitive match",
"evidence": "osv:CLSA-2026-1779827686",
"products": [
{
"name": {
"value": "gnutls",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.8.3-9.el9_6.tuxcare.1.els5",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "gnutls-c++",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.8.3-9.el9_6.tuxcare.1.els5",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "gnutls-dane",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.8.3-9.el9_6.tuxcare.1.els5",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "gnutls-devel",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.8.3-9.el9_6.tuxcare.1.els5",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "gnutls-utils",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.8.3-9.el9_6.tuxcare.1.els5",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1779827686",
"aliases": [
"CLSA-2026-1779827686"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.3-9.el9_6.tuxcare.1.els5"
}
]
}
],
"package": {
"name": "gnutls",
"purl": "pkg:rpm/tuxcare/gnutls?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-2026-1779827686.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.3-9.el9_6.tuxcare.1.els5"
}
]
}
],
"package": {
"name": "gnutls-c++",
"purl": "pkg:rpm/tuxcare/gnutls-c++?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-2026-1779827686.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.3-9.el9_6.tuxcare.1.els5"
}
]
}
],
"package": {
"name": "gnutls-dane",
"purl": "pkg:rpm/tuxcare/gnutls-dane?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-2026-1779827686.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.3-9.el9_6.tuxcare.1.els5"
}
]
}
],
"package": {
"name": "gnutls-devel",
"purl": "pkg:rpm/tuxcare/gnutls-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-2026-1779827686.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.3-9.el9_6.tuxcare.1.els5"
}
]
}
],
"package": {
"name": "gnutls-utils",
"purl": "pkg:rpm/tuxcare/gnutls-utils?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-2026-1779827686.json"
}
}
],
"modified": "2026-10-26T09:31:06.251977484Z",
"provider": "osv",
"upstream": [
"CVE-2026-3833"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1779827686.html"
]
},
"related_cves": [
{
"value": "CVE-2026-3833",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 447443,
"published_at": "2026-05-26T20:35:17+00:00"
}