OISF Suricata up to 8.0.5 DHCP parser rust/src/dhcp/dhcp.rs for_direction denial of service

Summaryinfo

A vulnerability described as critical has been identified in OISF Suricata up to 8.0.5. Affected by this issue is the function AppLayerTxData::for_direction of the file rust/src/dhcp/dhcp.rs of the component DHCP parser. Such manipulation leads to denial of service. This vulnerability is traded as CVE-2026-57224. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in OISF Suricata up to 8.0.5 and classified as critical. Affected by this issue is the function AppLayerTxData::for_direction of the file rust/src/dhcp/dhcp.rs of the component DHCP parser. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, the DHCP parser in rust/src/dhcp/dhcp.rs creates stateless transactions without recording their packet direction with AppLayerTxData::for_direction(), so a sensor that observes only one direction cannot mark the unseen direction inspected or free completed transactions. The RDP parser in rust/src/rdp/rdp.rs has the same direction-state defect. The per-flow transaction list can grow without bound and cleanup repeatedly scans it, causing increasing CPU and memory consumption and eventual denial of service. This issue is fixed in version 8.0.6.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-57224 since 06/24/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 8.0.6 eliminates this vulnerability.

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Productinfo

Vendor

• OISF

Name

• Suricata

Version

• 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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