---
id: CVE-2026-63447
title: >-
  Suricata is a network Intrusion Detection System, Intrusion Prevention System
  and Network Security Monitoring engine
summary: >-
  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.prot…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-407
vendor: OISF
product: suricata
affected:
  - 'suricata >= 8.0.5, < 8.0.6'
published: '2026-09-18'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:12:04.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63447'
references:
  - url: >-
      https://github.com/OISF/suricata/commit/15bf91c5ccbbbf640cd042e1c96974b262549385
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/82c41905589305e8389ceb793907ccb74798aee5
    label: security-advisories@github.com
  - url: 'https://github.com/OISF/suricata/releases/tag/suricata-8.0.6'
    label: security-advisories@github.com
  - url: 'https://github.com/OISF/suricata/security/advisories/GHSA-w394-3g33-3jg9'
    label: security-advisories@github.com
  - url: 'https://redmine.openinfosecfoundation.org/issues/8592'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00361
epssPercentile: 0.29949
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T18:21:07.869708Z'
ingestedAt: '2026-09-18T20:51:25.795Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.