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.
What this means for your business
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
What to do
- 1Ask your IT team or provider whether any of your systems use the affected product.
- 2If you do, follow the vendor's guidance. No patch reference has been published yet.
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Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness
- CWE-407
- Assigned by
- security-advisories@github.com
Dates
- Published
- 2026-09-18
- Last modified
- 2026-09-23
- Sources
- NVD
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