Suricata smb: some SMB flows can cause resource exhaustion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63448
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 21:17:04 UTC
Updated2026-09-18 21:17:04 UTC
DescriptionSuricata 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.004390000 probability, percentile 0.375900000 (date 2026-09-19)

Problem Types: CWE-400 | CWE-401 | CWE-407 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-401 CWE-401: Missing Release of Memory after Effective Lifetime | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OISF Suricata affected >= 8.0.0, < 8.0.6 Not specified
CNA OISF Suricata affected < 7.0.17 Not specified

References

ReferenceSourceLinkTags
github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4 [email protected] github.com
github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3 [email protected] github.com
github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a [email protected] github.com
github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476 [email protected] github.com
github.com/OISF/suricata/releases/tag/suricata-8.0.6 [email protected] github.com
redmine.openinfosecfoundation.org/issues/8629 [email protected] redmine.openinfosecfoundation.org
github.com/OISF/suricata/releases/tag/suricata-7.0.17 [email protected] github.com
github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce [email protected] github.com
github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281 [email protected] github.com
github.com/OISF/suricata/security/advisories/GHSA-hvvj-c8xx-9g35 [email protected] github.com
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