CVE-2026-5406 — Denial of Service
CVE-2026-5406 — FC-SWILS protocol dissector crash 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-674, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-5406 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-5406 - Wireshark FC-SWILS Dissector Crash (Free Tier)
title: CVE-2026-5406 - Wireshark FC-SWILS Dissector Crash (Free Tier)
id: scw-2026-04-30-ai-1
status: experimental
level: high
description: |
Detects the execution of Wireshark with a file open command, which could be an attempt to trigger the FC-SWILS protocol dissector crash vulnerability (CVE-2026-5406) leading to a denial of service. This rule is specific to Wireshark's executable path and common command-line arguments used for opening capture files.
author: SCW Feed Engine (AI-generated)
date: 2026-04-30
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-5406/
tags:
- attack.impact
- attack.t1499
logsource:
category: process_creation
detection:
selection:
Image|startswith:
- 'C:\Program Files\Wireshark\wireshark.exe'
CommandLine|contains:
- '-r'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-5406 | vulnerability | CVE-2026-5406 |
| CWE-674 | weakness | CWE-674 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 30, 2026 at 10:16 UTC |
This content was curated and summarized by Shimi's Cyber World for informational purposes. It is not copied or republished in full. All intellectual property rights remain with the original author and source.
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