CVE-2026-63447

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.

Score

CVSS 3.1 7.5 High

Status

Analyzed - security-advisories@github.com

Published

2026-09-18

Last modified

2026-09-21

Weaknesses

CWE-407

Affected products

• Suricata (Oisf)

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