---
id: CVE-2026-71418
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,
  DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously
  processed HTTP/2 DATA …
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 >= 8.0.0, < 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-2026-71418'
references:
  - url: >-
      https://github.com/OISF/suricata/commit/1731805967edf5d31448db2ae43cf72c6cf46c11
    label: security-advisories@github.com
  - url: >-
      https://github.com/OISF/suricata/commit/26c26dea84f00de95151a0e16d21c1fcafac9648
    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-xjgq-3qw4-jp5f'
    label: security-advisories@github.com
  - url: 'https://redmine.openinfosecfoundation.org/issues/8725'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.0063
epssPercentile: 0.47897
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T19:48:43.640552Z'
ingestedAt: '2026-09-18T20:51:25.793Z'
---

## Overview

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer. Multiple DATA frames with the EndOfStream flag set can grow the buffer to its 65 KiB limit while causing all prior contents to be processed again, producing quadratic CPU complexity, degraded packet processing, loss of monitoring visibility, or 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.