OISF Suricata up to 7.0.16/8.0.5 SMB Parser rust/src/smb memory allocation

Summaryinfo

A vulnerability categorized as critical has been discovered in OISF Suricata up to 7.0.16/8.0.5. Affected by this vulnerability is an unknown functionality of the file rust/src/smb of the component SMB Parser. The manipulation results in memory allocation. This vulnerability is cataloged as CVE-2026-63448. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in OISF Suricata up to 7.0.16/8.0.5. It has been classified as critical. Affected is an unknown functionality of the file rust/src/smb of the component SMB Parser. The manipulation with an unknown input leads to a memory allocation vulnerability. CWE is classifying the issue as CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-63448 since 07/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 7.0.17 or 8.0.6 eliminates this vulnerability.

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Productinfo

Vendor

• OISF

Name

• Suricata

Version

• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 7.0.11
• 7.0.12
• 7.0.13
• 7.0.14
• 7.0.15
• 7.0.16
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4
• 8.0.5

License

• open-source

Website

• Product: https://github.com/OISF/suricata/

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