Fix CVE(s): CVE-2026-33846, CVE-2026-42009, CVE-2026-5260
* SECURITY UPDATE: heap buffer overflow in DTLS handshake reassembly - debian/patches/CVE-2026-33846.patch: add length-consistency and array bounds checks in merge_handshake_packet in lib/buffers.c to reject DTLS fragments with mismatching or oversized claimed length - CVE-2026-33846 * SECURITY UPDATE: denial of service via non-conforming qsort comparator - debian/patches/CVE-2026-42009.patch: return 0 for equal sequence numbers in handshake_compare in lib/buffers.c so DTLS packet ordering follows the qsort strict-weak-ordering contract - CVE-2026-42009 * SECURITY UPDATE: heap over-read on short RSA-PSK ciphertext with PKCS#11 key - debian/patches/CVE-2026-5260.patch: verify ciphertext size matches the RSA modulus in _gnutls_proc_rsa_psk_client_kx in lib/auth/rsa_psk.c and size the PKCS#11 decrypt buffer with MAX(siglen, plaintext_size) in lib/pkcs11_privkey.c (the RSA path uses the allocating decrypt API and is not affected) - CVE-2026-5260
- 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.els4
- CVEs
- CVE-2026-33846, CVE-2026-42009, CVE-2026-5260
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:41 UTC · Revision 1
Source evidence
Fix CVE(s): CVE-2026-33846, CVE-2026-42009, CVE-2026-5260
core-osv · Original sourcePublished 14 Jul 2026, 08:36 UTC
* SECURITY UPDATE: heap buffer overflow in DTLS handshake reassembly - debian/patches/CVE-2026-33846.patch: add length-consistency and array bounds checks in merge_handshake_packet in lib/buffers.c to reject DTLS fragments with mismatching or oversized claimed length - CVE-2026-33846 * SECURITY UPDATE: denial of service via non-conforming qsort comparator - debian/patches/CVE-2026-42009.patch: return 0 for equal sequence numbers in handshake_compare in lib/buffers.c so DTLS packet ordering follows the qsort strict-weak-ordering contract - CVE-2026-42009 * SECURITY UPDATE: heap over-read on short RSA-PSK ciphertext with PKCS#11 key - debian/patches/CVE-2026-5260.patch: verify ciphertext size matches the RSA modulus in _gnutls_proc_rsa_psk_client_kx in lib/auth/rsa_psk.c and size the PKCS#11 decrypt buffer with MAX(siglen, plaintext_size) in lib/pkcs11_privkey.c (the RSA path uses the allocating decrypt API and is not affected) - CVE-2026-5260
osv:CLSA-2026-1784018158
gnutls-bin
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els4
gnutls-doc
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els4
libgnutls-dane0
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els4
libgnutls-openssl27
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els4
libgnutls28-dev
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els4
libgnutls30
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els4
libgnutlsxx28
Fixed versions: 3.5.18-1ubuntu1.6+tuxcare.els4
Complete source record
{
"id": "a269cda76531fef11b4c0a014cca853fbc7cfbf5bc7f88bf42bb0811d89637d9",
"url": "https://osv.dev/vulnerability/CLSA-2026-1784018158",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-33846, CVE-2026-42009, CVE-2026-5260",
"summary": "* SECURITY UPDATE: heap buffer overflow in DTLS handshake reassembly - debian/patches/CVE-2026-33846.patch: add length-consistency and array bounds checks in merge_handshake_packet in lib/buffers.c to reject DTLS fragments with mismatching or oversized claimed length - CVE-2026-33846 * SECURITY UPDATE: denial of service via non-conforming qsort comparator - debian/patches/CVE-2026-42009.patch: return 0 for equal sequence numbers in handshake_compare in lib/buffers.c so DTLS packet ordering follows the qsort strict-weak-ordering contract - CVE-2026-42009 * SECURITY UPDATE: heap over-read on short RSA-PSK ciphertext with PKCS#11 key - debian/patches/CVE-2026-5260.patch: verify ciphertext size matches the RSA modulus in _gnutls_proc_rsa_psk_client_kx in lib/auth/rsa_psk.c and size the PKCS#11 decrypt buffer with MAX(siglen, plaintext_size) in lib/pkcs11_privkey.c (the RSA path uses the allocating decrypt API and is not affected) - CVE-2026-5260",
"evidence": "osv:CLSA-2026-1784018158",
"products": [
{
"name": {
"value": "gnutls-bin",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els4",
"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.els4",
"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.els4",
"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.els4",
"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.els4",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutls30",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els4",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libgnutlsxx28",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.18-1ubuntu1.6+tuxcare.els4",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1784018158",
"aliases": [
"CLSA-2026-1784018158"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els4"
}
]
}
],
"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-2026-1784018158.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"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-2026-1784018158.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"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-2026-1784018158.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els4"
}
]
}
],
"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-2026-1784018158.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els4"
}
]
}
],
"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-2026-1784018158.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els4"
}
]
}
],
"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-2026-1784018158.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.6+tuxcare.els4"
}
]
}
],
"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-2026-1784018158.json"
}
}
],
"modified": "2026-10-26T09:32:03.571353167Z",
"provider": "osv",
"upstream": [
"CVE-2026-33846",
"CVE-2026-42009",
"CVE-2026-5260"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1784018158.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-33846",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42009",
"https://nvd.nist.gov/vuln/detail/CVE-2026-5260"
]
},
"related_cves": [
{
"value": "CVE-2026-33846",
"evidence": "/upstream"
},
{
"value": "CVE-2026-42009",
"evidence": "/upstream"
},
{
"value": "CVE-2026-5260",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449531,
"published_at": "2026-07-14T08:36:17+00:00"
}