CVE-2026-63448 - Suricata smb: some SMB flows can cause resource exhaustion
Brief
CVE ID : CVE-2026-63448
Published : Sept. 18, 2026, 8:20 p. m.
- 36 minutes ago
Description : Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.
- 17 and 8.
- 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.
- 6 and 7.
- 17.
Severity: 0.0
- NA
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