CVE-2026-63446
Description
A flaw was found in Suricata, a network Intrusion Detection System (IDS), Intrusion Prevention System (IPS), and Network Security Monitoring engine. Due to an inverted guard in the AppLayerParserSetTransactionInspectId() function, transactions on flows passed by a pass rule or exception policy are not correctly marked as inspected. This oversight prevents completed transactions from being freed, leading to their repeated rescanning. A remote attacker could exploit this by sending specially crafted network traffic, causing the per-flow list to grow indefinitely, resulting in CPU and memory exhaustion and a Denial of Service (DoS).
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (Other); DoS: Resource Consumption (Memory); DoS: Resource Consumption (CPU)
An attacker that can influence the allocation of resources that are not properly released could deplete the available resource pool and prevent all other processes from accessing the same type of resource. Frequently-affected resources include memory, CPU, disk space, power or battery, etc.
Frequently Asked Questions
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