Fix CVE(s): CVE-2026-42011, CVE-2026-42012, CVE-2026-42013, CVE-2026-42015
* SECURITY UPDATE: name-constraints bypass with excluded-only parent CA - debian/patches/CVE-2026-42011.patch: take permitted name constraints into account when a prior CA in the chain carried only excluded constraints, so a constrained sub-CA can no longer issue certificates outside its permitted scope, in lib/x509/name_constraints.c. - CVE-2026-42011 * 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, libgnutls-dane0, libgnutls-openssl27, libgnutls28-dev, libgnutls30, libgnutlsxx28
- Affected versions
- Not specified
- Fixed versions
- 3.5.18-1ubuntu1.6+tuxcare.els5
- CVEs
- CVE-2026-42011, 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-2026-42011, CVE-2026-42012, CVE-2026-42013, CVE-2026-42015
core-osv · Original sourcePublished 17 Jul 2026, 06:09 UTC
* SECURITY UPDATE: name-constraints bypass with excluded-only parent CA - debian/patches/CVE-2026-42011.patch: take permitted name constraints into account when a prior CA in the chain carried only excluded constraints, so a constrained sub-CA can no longer issue certificates outside its permitted scope, in lib/x509/name_constraints.c. - CVE-2026-42011 * 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-2026-1784268522
gnutls-bin
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els5
gnutls-doc
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els5
libgnutls-dane0
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els5
libgnutls-openssl27
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els5
libgnutls28-dev
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els5
libgnutls30
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els5
libgnutlsxx28
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els5
Complete source record
{
"id": "c4ae82140c332d92ab50ffd02d42773fc144d410bda31a5fa5f12e39a03753b9",
"url": "https://osv.dev/vulnerability/CLSA-2026-1784268522",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-42011, CVE-2026-42012, CVE-2026-42013, CVE-2026-42015",
"summary": "* SECURITY UPDATE: name-constraints bypass with excluded-only parent CA - debian/patches/CVE-2026-42011.patch: take permitted name constraints into account when a prior CA in the chain carried only excluded constraints, so a constrained sub-CA can no longer issue certificates outside its permitted scope, in lib/x509/name_constraints.c. - CVE-2026-42011 * 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-2026-1784268522",
"products": [
{
"name": {
"value": "gnutls-bin",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els5",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "gnutls-doc",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els5",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls-dane0",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els5",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls-openssl27",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els5",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls28-dev",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els5",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls30",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els5",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutlsxx28",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els5",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1784268522",
"aliases": [
"CLSA-2026-1784268522"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els5"
}
]
}
],
"package": {
"name": "gnutls-bin",
"purl": "pkg:deb/tuxcare/gnutls-bin?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1784268522.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els5"
}
]
}
],
"package": {
"name": "gnutls-doc",
"purl": "pkg:deb/tuxcare/gnutls-doc?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1784268522.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els5"
}
]
}
],
"package": {
"name": "libgnutls-dane0",
"purl": "pkg:deb/tuxcare/libgnutls-dane0?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1784268522.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els5"
}
]
}
],
"package": {
"name": "libgnutls-openssl27",
"purl": "pkg:deb/tuxcare/libgnutls-openssl27?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1784268522.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els5"
}
]
}
],
"package": {
"name": "libgnutls28-dev",
"purl": "pkg:deb/tuxcare/libgnutls28-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1784268522.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els5"
}
]
}
],
"package": {
"name": "libgnutls30",
"purl": "pkg:deb/tuxcare/libgnutls30?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1784268522.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els5"
}
]
}
],
"package": {
"name": "libgnutlsxx28",
"purl": "pkg:deb/tuxcare/libgnutlsxx28?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1784268522.json"
}
}
],
"modified": "2026-10-26T09:31:47.202590922Z",
"provider": "osv",
"upstream": [
"CVE-2026-42011",
"CVE-2026-42012",
"CVE-2026-42013",
"CVE-2026-42015"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1784268522.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42011",
"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-2026-42011",
"evidence": "/upstream"
},
{
"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": 448478,
"published_at": "2026-07-17T06:09:11+00:00"
}