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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00439.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

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OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476 cve-icon cve-icon
https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4 cve-icon cve-icon
https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a cve-icon cve-icon
https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281 cve-icon cve-icon
https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce cve-icon cve-icon
https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3 cve-icon cve-icon
https://github.com/OISF/suricata/releases/tag/suricata-7.0.17 cve-icon cve-icon
https://github.com/OISF/suricata/releases/tag/suricata-8.0.6 cve-icon cve-icon
https://github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35 cve-icon cve-icon
https://redmine.openinfosecfoundation.org/issues/8629 cve-icon cve-icon
History

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Suricata smb: some SMB flows can cause resource exhaustion
Weaknesses CWE-400
CWE-401
CWE-407
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-18T20:20:01.185Z

Reserved: 2026-07-16T19:35:57.767Z

Link: CVE-2026-63448

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-18T21:17:04.060

Modified: 2026-09-18T21:17:04.060

Link: CVE-2026-63448

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-19T11:30:06Z

Weaknesses