CriticalFix available
gnutls28 — security advisory
A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.
- Products
- gnutls28
- Affected versions
- 3.7.9-2, 3.7.9-2+deb12u1, 3.7.9-2+deb12u2, 3.7.9-2+deb12u3, 3.7.9-2+deb12u4, 3.7.9-2+deb12u5, 3.7.9-2+deb12u6, 3.8.10-1, 3.8.10-2, 3.8.10-3, 3.8.11-1, 3.8.11-2, 3.8.11-3, 3.8.12-1, 3.8.12-2, 3.8.12-3, 3.8.12-4, 3.8.9-3, 3.8.9-3+deb13u1, 3.8.9-3+deb13u2, 3.8.9-3+deb13u3
- Fixed versions
- 3.7.9-2+deb12u7, 3.8.13-1, 3.8.9-3+deb13u4
- CVEs
- CVE-2026-33845
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:41 UTC · Revision 1
Source evidence
A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.
osv:DEBIAN-CVE-2026-33845
gnutls28
Fixed versions: 3.7.9-2+deb12u7
gnutls28
Fixed versions: 3.8.9-3+deb13u4
gnutls28
Fixed versions: 3.8.13-1
Complete source record
{
"id": "a0f965208c544012233af438d501af41b4eaa6a31fa7d47f836dddf30cce32f7",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-33845",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-33845",
"summary": "A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.",
"evidence": "osv:DEBIAN-CVE-2026-33845",
"products": [
{
"name": {
"value": "gnutls28",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.7.9-2+deb12u7",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "3.7.9-2",
"evidence": "/affected/0/versions"
},
{
"value": "3.7.9-2+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.7.9-2+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.7.9-2+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "3.7.9-2+deb12u4",
"evidence": "/affected/0/versions"
},
{
"value": "3.7.9-2+deb12u5",
"evidence": "/affected/0/versions"
},
{
"value": "3.7.9-2+deb12u6",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "gnutls28",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.8.9-3+deb13u4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "3.8.9-3",
"evidence": "/affected/1/versions"
},
{
"value": "3.8.9-3+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "3.8.9-3+deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "3.8.9-3+deb13u3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "gnutls28",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.8.13-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "3.8.10-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.10-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.10-3",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.11-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.11-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.11-3",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.12-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.12-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.12-3",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.12-4",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.9-3",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-33845",
"aliases": [
"DEBIAN-CVE-2026-33845"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.7.9-2+deb12u7"
}
]
}
],
"package": {
"name": "gnutls28",
"purl": "pkg:deb/debian/gnutls28?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.7.9-2",
"3.7.9-2+deb12u1",
"3.7.9-2+deb12u2",
"3.7.9-2+deb12u3",
"3.7.9-2+deb12u4",
"3.7.9-2+deb12u5",
"3.7.9-2+deb12u6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33845.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.9-3+deb13u4"
}
]
}
],
"package": {
"name": "gnutls28",
"purl": "pkg:deb/debian/gnutls28?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.8.9-3",
"3.8.9-3+deb13u1",
"3.8.9-3+deb13u2",
"3.8.9-3+deb13u3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33845.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.13-1"
}
]
}
],
"package": {
"name": "gnutls28",
"purl": "pkg:deb/debian/gnutls28?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.8.10-1",
"3.8.10-2",
"3.8.10-3",
"3.8.11-1",
"3.8.11-2",
"3.8.11-3",
"3.8.12-1",
"3.8.12-2",
"3.8.12-3",
"3.8.12-4",
"3.8.9-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33845.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:30.877059519Z",
"provider": "osv",
"upstream": [
"CVE-2026-33845"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-33845"
]
},
"related_cves": [
{
"value": "CVE-2026-33845",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 460988,
"published_at": "2026-04-30T18:16:28.003+00:00"
}