CVE-2026-26204 — Denial of Service

title: Wazuh Heap Out-of-Bounds Write via Crafted Alert - CVE-2026-26204
id: scw-2026-04-29-ai-1
status: experimental
level: high
description: |
  Detects the modification of Wazuh alert log files, specifically 'alerts.json' or 'alerts.log', which is the target for injecting a specially crafted alert to trigger the heap-based out-of-bounds WRITE vulnerability (CVE-2026-26204) in versions prior to 4.14.4. This can lead to a denial of service or heap corruption.
author: SCW Feed Engine (AI-generated)
date: 2026-04-29
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-26204/
tags:
  - attack.defense_evasion
  - attack.t1499
logsource:
    category: file_event
detection:
  selection:
      TargetFilename|contains:
          - '/var/ossec/logs/alerts/alerts.json'
      EventType: 'modify'
  selection_base:
      TargetFilename|contains:
          - '/var/ossec/logs/alerts/alerts.json'
  selection_indicators:
      TargetFilename|contains:
          - '/var/ossec/logs/alerts/alerts.log'
      condition: selection AND selection_indicators
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse