Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/OISF/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385
- https://github.com/OISF/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5
- https://github.com/OISF/suricata/releases/tag/suricata-8.0.6
- https://github.com/OISF/suricata/security/advisories/GHSA-w394-3g33-3jg9
- https://redmine.openinfosecfoundation.org/issues/8592
FAQ
What is CVE-2026-63447?
CVE-2026-63447 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 allocat...
How severe is CVE-2026-63447?
CVE-2026-63447 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63447?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.