CVE-2026-5407 — Denial of Service
CVE-2026-5407 — SMB2 protocol dissector infinite loop in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
What This Means For You
- If your environment is affected by CWE-835, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-5407 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Wireshark SMB2 Dissector Infinite Loop DoS Attempt — CVE-2026-5407
title: Wireshark SMB2 Dissector Infinite Loop DoS Attempt — CVE-2026-5407
id: scw-2026-04-30-ai-1
status: experimental
level: high
description: |
Detects the execution of Wireshark with command-line arguments related to SMB2 dissection, which is the vulnerable component in CVE-2026-5407. This rule aims to identify potential exploitation attempts leading to a denial of service.
author: SCW Feed Engine (AI-generated)
date: 2026-04-30
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-5407/
tags:
- attack.impact
- attack.t1499
logsource:
category: process_creation
detection:
selection:
Image|endswith:
- 'wireshark.exe'
CommandLine|contains:
- 'smb2'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-5407 | vulnerability | CVE-2026-5407 |
| CWE-835 | weakness | CWE-835 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 30, 2026 at 10:16 UTC |
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