CVE-2026-63447: CWE-407: Inefficient Algorithmic Complexity in OISF suricata
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.
AI Analysis
Technical Summary
Suricata, a network IDS/IPS and monitoring engine, has an inefficient algorithmic complexity vulnerability (CWE-407) in its FTP parser component (src/app-layer-ftp.c) from versions 8.0.5 to before 8.0.6. When processing a large chunk of FTP command data, the parser can allocate transactions beyond the limit set by app-layer.protocols.ftp.max-tx. This results in an oversized transaction list that is repeatedly processed with quadratic complexity after the too_many_transactions event. This flaw allows crafted FTP traffic to degrade packet processing performance, reduce monitoring visibility, or cause denial of service. The vulnerability is addressed in Suricata version 8.0.6.
Potential Impact
An attacker can send specially crafted FTP traffic that triggers excessive transaction allocations, causing Suricata to process an oversized transaction list with quadratic complexity. This leads to degraded packet processing performance, potentially reducing the effectiveness of network monitoring or causing denial of service conditions. There is no impact on confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
Upgrade Suricata to version 8.0.6 or later, where this vulnerability is fixed. No other mitigation is indicated or required.
CVE-2026-63447: CWE-407: Inefficient Algorithmic Complexity in OISF suricata
Description
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.
CVSS v3.1
Score 7.5high
Affected software
OISF
suricata
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Suricata, a network IDS/IPS and monitoring engine, has an inefficient algorithmic complexity vulnerability (CWE-407) in its FTP parser component (src/app-layer-ftp.c) from versions 8.0.5 to before 8.0.6. When processing a large chunk of FTP command data, the parser can allocate transactions beyond the limit set by app-layer.protocols.ftp.max-tx. This results in an oversized transaction list that is repeatedly processed with quadratic complexity after the too_many_transactions event. This flaw allows crafted FTP traffic to degrade packet processing performance, reduce monitoring visibility, or cause denial of service. The vulnerability is addressed in Suricata version 8.0.6.
Potential Impact
An attacker can send specially crafted FTP traffic that triggers excessive transaction allocations, causing Suricata to process an oversized transaction list with quadratic complexity. This leads to degraded packet processing performance, potentially reducing the effectiveness of network monitoring or causing denial of service conditions. There is no impact on confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
Upgrade Suricata to version 8.0.6 or later, where this vulnerability is fixed. No other mitigation is indicated or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-16T19:35:57.767Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aad9fc955bf5e2cf583e409
Added to database: 09/18/2026, 20:32:09 UTC
Last enriched: 09/18/2026, 20:46:33 UTC
Last updated: 09/19/2026, 01:11:17 UTC
Views: 7
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