Suricata ftp: crafted FTP traffic can cause quadratic CPU consumption

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63447
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 21:17:03 UTC
Updated2026-09-18 21:17:03 UTC
DescriptionSuricata 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003610000 probability, percentile 0.299240000 (date 2026-09-19)

Problem Types: CWE-407 | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OISF Suricata affected >= 8.0.5, < 8.0.6 Not specified

References

ReferenceSourceLinkTags
github.com/OISF/suricata/security/advisories/GHSA-w394-3g33-3jg9 [email protected] github.com
redmine.openinfosecfoundation.org/issues/8592 [email protected] redmine.openinfosecfoundation.org
github.com/OISF/suricata/releases/tag/suricata-8.0.6 [email protected] github.com
github.com/OISF/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385 [email protected] github.com
github.com/OISF/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5 [email protected] github.com
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