---
id: CVE-2026-63446
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 8.0.0 until 8.0.6,
  AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an
  inverted guard and ma…
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-401
  - CWE-407
vendor: OISF
product: suricata
affected:
  - 'suricata >= 8.0.0, < 8.0.6'
published: '2026-09-18'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:25:00.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63446'
references:
  - url: >-
      https://github.com/OISF/suricata/commit/006e21c1ccc38c1c815e7945d54b4638cc5f0de8
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/60a83c62a1dfdfb589b2bad27fb7fc339fc964b7
    label: security-advisories@github.com
  - url: 'https://github.com/OISF/suricata/pull/15726'
    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-gjwr-75gq-877m'
    label: security-advisories@github.com
  - url: 'https://redmine.openinfosecfoundation.org/issues/8628'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00388
epssPercentile: 0.32783
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T16:18:53.670399Z'
ingestedAt: '2026-09-18T20:51:25.796Z'
---

## Overview

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and marks only already-inspected transactions as inspected. On flows passed by a pass rule or pass-the-flow exception policy, detection is skipped, so completed transactions remain unmarked, are never freed, and are repeatedly rescanned. The per-flow list can grow without bound with quadratic cleanup cost, causing CPU and memory exhaustion. This issue is fixed in version 8.0.6.

## Remediation

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