OISF Suricata up to 8.0.5 AppLayerParser src/app-layer-parser.c AppLayerParserSetTransactionInspectId memory allocation

Summaryinfo

A vulnerability classified as critical was found in OISF Suricata up to 8.0.5. The affected element is the function AppLayerParserSetTransactionInspectId of the file src/app-layer-parser.c of the component AppLayerParser. The manipulation results in memory allocation. This vulnerability is known as CVE-2026-63446. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in OISF Suricata up to 8.0.5. Affected is the function AppLayerParserSetTransactionInspectId of the file src/app-layer-parser.c of the component AppLayerParser. 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. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and marks only already-inspected transactions as inspected. On flows passed by a pass rule or pass-the-flow exception policy, detection is skipped, so completed transactions remain unmarked, are never freed, and are repeatedly rescanned. The per-flow list can grow without bound with quadratic cleanup cost, causing CPU and memory exhaustion. This issue is fixed in version 8.0.6.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-63446 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. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 348327 (Linux Distros Unpatched Vulnerability : CVE-2026-63446), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.0.6 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (348327) and EUVD (EUVD-2026-83395). Once again VulDB remains the best source for vulnerability data.

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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Once again VulDB remains the best source for vulnerability data.

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