---
id: CVE-2026-63448
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. Prior to 7.0.17 and 8.0.6, the SMB
  parser can retain force-completed transactions on flows where Suricata sees
  payload …
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-401
  - CWE-407
vendor: OISF
product: suricata
affected:
  - 'suricata >= 8.0.0, < 8.0.6'
  - suricata < 7.0.17
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-2026-63448'
references:
  - url: >-
      https://github.com/OISF/suricata/commit/755d6c3061de4d7ba97f0ed31cdc17ab8cab4476
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/7ec9d72d28b9370712cf77a5b9d40d6b5db27cb4
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/88adab8bd3d62912941647ab65032d5ec75c893a
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/9a54a043516e644bb7b9d34117a91977f950a281
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/bc39274a638d1cca2391cfa4891c8b6c255ff9ce
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/c8f68b0e4f9e721dca1c9ed6e08597c6964c7ac3
    label: security-advisories@github.com
  - url: 'https://github.com/OISF/suricata/releases/tag/suricata-7.0.17'
    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-hvvj-c8xx-9g35'
    label: security-advisories@github.com
  - url: 'https://redmine.openinfosecfoundation.org/issues/8629'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00718
epssPercentile: 0.51799
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T15:48:35.862458Z'
ingestedAt: '2026-09-18T20:51:25.796Z'
---

## Overview

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the SMB parser can retain force-completed transactions on flows where Suricata sees payload in only one direction, including async-oneside flows, because cleanup waits for inspection in the unseen direction. The transaction creation paths in rust/src/smb can exceed the intended SMB_MAX_TX bound, and cleanup repeatedly scans the growing list. Sustained one-directional SMB traffic can therefore cause unbounded per-flow state and CPU and memory exhaustion. This issue is fixed in versions 8.0.6 and 7.0.17.

## Remediation

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