UBUNTU-CVE-2026-63448 (CVE-2026-63448)
Vulnerability from osv_ubuntu – Published: 2026-09-21 00:00 – Updated: 2026-09-21 00:00 – Source website
VLAI
Details
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the SMB parser can retain force-completed transactions on flows where Suricata sees payload in only one direction, including async-oneside flows, because cleanup waits for inspection in the unseen direction. The transaction creation paths in rust/src/smb can exceed the intended SMB_MAX_TX bound, and cleanup repeatedly scans the growing list. Sustained one-directional SMB traffic can therefore cause unbounded per-flow state and CPU and memory exhaustion. This issue is fixed in versions 8.0.6 and 7.0.17.
Severity
5.9 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "suricata",
"binary_version": "3.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "suricata",
"purl": "pkg:deb/ubuntu/suricata@3.0-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.8-1build1",
"2.0.9-1",
"2.0.10-1",
"2.0.10-2",
"2.0.11-1",
"3.0-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libhtp-0.5.23-1",
"binary_version": "3.2-2ubuntu3"
},
{
"binary_name": "suricata",
"binary_version": "3.2-2ubuntu3"
},
{
"binary_name": "suricata-hyperscan",
"binary_version": "3.2-2ubuntu3"
},
{
"binary_name": "suricata-oinkmaster",
"binary_version": "3.2-2ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "suricata",
"purl": "pkg:deb/ubuntu/suricata@3.2-2ubuntu3?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.2-2ubuntu3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "suricata",
"binary_version": "1:6.0.4-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "suricata",
"purl": "pkg:deb/ubuntu/suricata@1:6.0.4-3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:6.0.4-2",
"1:6.0.4-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "suricata",
"binary_version": "1:7.0.3-1build3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "suricata",
"purl": "pkg:deb/ubuntu/suricata@1:7.0.3-1build3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.0.0-2",
"1:7.0.2-1",
"1:7.0.2-1build1",
"1:7.0.3-1build1",
"1:7.0.3-1build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "suricata",
"binary_version": "1:8.0.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "suricata",
"purl": "pkg:deb/ubuntu/suricata@1:8.0.3-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.0.10-1",
"1:8.0.1-3build1",
"1:8.0.2-1",
"1:8.0.2-1build1",
"1:8.0.3-1"
]
}
],
"aliases": [],
"details": "Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the SMB parser can retain force-completed transactions on flows where Suricata sees payload in only one direction, including async-oneside flows, because cleanup waits for inspection in the unseen direction. The transaction creation paths in rust/src/smb can exceed the intended SMB_MAX_TX bound, and cleanup repeatedly scans the growing list. Sustained one-directional SMB traffic can therefore cause unbounded per-flow state and CPU and memory exhaustion. This issue is fixed in versions 8.0.6 and 7.0.17.",
"id": "UBUNTU-CVE-2026-63448",
"modified": "2026-09-21T00:00:00Z",
"published": "2026-09-21T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-63448"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-63448"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/releases/tag/suricata-7.0.17"
},
{
"type": "REPORT",
"url": "https://github.com/OISF/suricata/releases/tag/suricata-8.0.6"
},
{
"type": "REPORT",
"url": "https://redmine.openinfosecfoundation.org/issues/8629"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-63448"
]
}
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Sightings
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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