High [CVE-2026-63447] Denial of Service via crafted FTP traffic
This high-severity Red Hat Linux advisory covers CVE-2026-63447.
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Summary
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.5 until 8.0.6, the FTP parser in src/app-layer-ftp.c can continue allocating transactions after app-layer.protocols.ftp.max-tx is reached while processing one large chunk of FTP command data.
The oversized transaction list is repeatedly processed with quadratic complexity after the too_many_transactions event, allowing crafted FTP traffic to degrade packet processing, reduce monitoring visibility, or cause denial of service. This issue is fixed in version 8.0.6.
A flaw was found in Suricata. A remote, unauthenticated attacker can exploit this issue by sending specially crafted File Transfer Protocol (FTP) traffic containing large command sequences, causing the parser to allocate transactions beyond expected limits.
Processing this oversized transaction list leads to excessive CPU resource consumption, resulting in degraded packet inspection capabilities and a Denial of Service (DoS).
This vulnerability is rated as Important because an unauthenticated remote attacker transmitting network traffic inspected by Suricata can trigger severe CPU exhaustion without requiring privileges, leading to packet processing starvation and denial of service.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
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