Fix CVE(s): CVE-2026-42012, CVE-2026-42013, CVE-2026-42015
* SECURITY UPDATE: CN fallback not precluded by URI SAN - debian/patches/CVE-2026-42012.patch: treat a URI subject alternative name as precluding the fallback to Common Name hostname matching, per RFC 6125 6.4.4, in lib/x509/hostname-verify.c. - CVE-2026-42012 * SECURITY UPDATE: CN/DN fallback not precluded by oversized SAN - debian/patches/CVE-2026-42013.patch: keep the CN (hostname) and DN-email fallbacks disabled when a subject alternative name is oversized instead of silently ignoring it, per RFC 6125 6.4.4, in lib/x509/hostname-verify.c and lib/x509/email-verify.c. - CVE-2026-42013 * SECURITY UPDATE: PKCS#12 bag out-of-bounds write - debian/patches/CVE-2026-42015.patch: fix an off-by-one in the PKCS#12 bag element bounds check that allowed writing past the 32-element array, in lib/x509/pkcs12_bag.c. - CVE-2026-42015
- Products
- gnutls-bin, gnutls-doc, guile-gnutls, libgnutls-dev, libgnutls-openssl27, libgnutls28-dev, libgnutls30, libgnutlsxx28
- Affected versions
- Not specified
- Fixed versions
- 3.4.10-4ubuntu1.9+tuxcare.els4
- CVEs
- CVE-2026-42012, CVE-2026-42013, CVE-2026-42015
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:09 UTC · Revision 1
Source evidence
Fix CVE(s): CVE-2026-42012, CVE-2026-42013, CVE-2026-42015
core-osv · Original sourcePublished 17 Jul 2026, 15:49 UTC
* SECURITY UPDATE: CN fallback not precluded by URI SAN - debian/patches/CVE-2026-42012.patch: treat a URI subject alternative name as precluding the fallback to Common Name hostname matching, per RFC 6125 6.4.4, in lib/x509/hostname-verify.c. - CVE-2026-42012 * SECURITY UPDATE: CN/DN fallback not precluded by oversized SAN - debian/patches/CVE-2026-42013.patch: keep the CN (hostname) and DN-email fallbacks disabled when a subject alternative name is oversized instead of silently ignoring it, per RFC 6125 6.4.4, in lib/x509/hostname-verify.c and lib/x509/email-verify.c. - CVE-2026-42013 * SECURITY UPDATE: PKCS#12 bag out-of-bounds write - debian/patches/CVE-2026-42015.patch: fix an off-by-one in the PKCS#12 bag element bounds check that allowed writing past the 32-element array, in lib/x509/pkcs12_bag.c. - CVE-2026-42015
osv:CLSA-2026-1784303329
gnutls-bin
Fixed versions: 3.4.10-4ubuntu1.9+tuxcare.els4
gnutls-doc
Fixed versions: 3.4.10-4ubuntu1.9+tuxcare.els4
guile-gnutls
Fixed versions: 3.4.10-4ubuntu1.9+tuxcare.els4
libgnutls-dev
Fixed versions: 3.4.10-4ubuntu1.9+tuxcare.els4
libgnutls-openssl27
Fixed versions: 3.4.10-4ubuntu1.9+tuxcare.els4
libgnutls28-dev
Fixed versions: 3.4.10-4ubuntu1.9+tuxcare.els4
libgnutls30
Fixed versions: 3.4.10-4ubuntu1.9+tuxcare.els4
libgnutlsxx28
Fixed versions: 3.4.10-4ubuntu1.9+tuxcare.els4
Complete source record
{
"id": "5651d41afd1dc70f1cfd324607306de16e87bd9e1eb13fe10cf8bf716e581fd9",
"url": "https://osv.dev/vulnerability/CLSA-2026-1784303329",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-42012, CVE-2026-42013, CVE-2026-42015",
"summary": "* SECURITY UPDATE: CN fallback not precluded by URI SAN - debian/patches/CVE-2026-42012.patch: treat a URI subject alternative name as precluding the fallback to Common Name hostname matching, per RFC 6125 6.4.4, in lib/x509/hostname-verify.c. - CVE-2026-42012 * SECURITY UPDATE: CN/DN fallback not precluded by oversized SAN - debian/patches/CVE-2026-42013.patch: keep the CN (hostname) and DN-email fallbacks disabled when a subject alternative name is oversized instead of silently ignoring it, per RFC 6125 6.4.4, in lib/x509/hostname-verify.c and lib/x509/email-verify.c. - CVE-2026-42013 * SECURITY UPDATE: PKCS#12 bag out-of-bounds write - debian/patches/CVE-2026-42015.patch: fix an off-by-one in the PKCS#12 bag element bounds check that allowed writing past the 32-element array, in lib/x509/pkcs12_bag.c. - CVE-2026-42015",
"evidence": "osv:CLSA-2026-1784303329",
"products": [
{
"name": {
"value": "gnutls-bin",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.4.10-4ubuntu1.9+tuxcare.els4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "gnutls-doc",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.4.10-4ubuntu1.9+tuxcare.els4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "guile-gnutls",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.4.10-4ubuntu1.9+tuxcare.els4",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls-dev",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.4.10-4ubuntu1.9+tuxcare.els4",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls-openssl27",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.4.10-4ubuntu1.9+tuxcare.els4",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls28-dev",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.4.10-4ubuntu1.9+tuxcare.els4",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls30",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.4.10-4ubuntu1.9+tuxcare.els4",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutlsxx28",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.4.10-4ubuntu1.9+tuxcare.els4",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1784303329",
"aliases": [
"CLSA-2026-1784303329"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.9+tuxcare.els4"
}
]
}
],
"package": {
"name": "gnutls-bin",
"purl": "pkg:deb/tuxcare/gnutls-bin?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1784303329.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.9+tuxcare.els4"
}
]
}
],
"package": {
"name": "gnutls-doc",
"purl": "pkg:deb/tuxcare/gnutls-doc?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1784303329.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.9+tuxcare.els4"
}
]
}
],
"package": {
"name": "guile-gnutls",
"purl": "pkg:deb/tuxcare/guile-gnutls?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1784303329.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.9+tuxcare.els4"
}
]
}
],
"package": {
"name": "libgnutls-dev",
"purl": "pkg:deb/tuxcare/libgnutls-dev?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1784303329.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.9+tuxcare.els4"
}
]
}
],
"package": {
"name": "libgnutls-openssl27",
"purl": "pkg:deb/tuxcare/libgnutls-openssl27?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1784303329.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.9+tuxcare.els4"
}
]
}
],
"package": {
"name": "libgnutls28-dev",
"purl": "pkg:deb/tuxcare/libgnutls28-dev?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1784303329.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.9+tuxcare.els4"
}
]
}
],
"package": {
"name": "libgnutls30",
"purl": "pkg:deb/tuxcare/libgnutls30?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1784303329.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.9+tuxcare.els4"
}
]
}
],
"package": {
"name": "libgnutlsxx28",
"purl": "pkg:deb/tuxcare/libgnutlsxx28?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1784303329.json"
}
}
],
"modified": "2026-10-26T09:31:47.113692325Z",
"provider": "osv",
"upstream": [
"CVE-2026-42012",
"CVE-2026-42013",
"CVE-2026-42015"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu16.04els/CLSA-2026-1784303329.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42012",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42013",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42015"
]
},
"related_cves": [
{
"value": "CVE-2026-42012",
"evidence": "/upstream"
},
{
"value": "CVE-2026-42013",
"evidence": "/upstream"
},
{
"value": "CVE-2026-42015",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448474,
"published_at": "2026-07-17T15:49:16+00:00"
}