bx33661 Wireshark-MCP up to 1.1.5 wireshark_export_objects dest_dir path traversal

Summaryinfo

A vulnerability identified as critical has been detected in bx33661 Wireshark-MCP up to 1.1.5. Affected by this vulnerability is the function wireshark_export_objects. This manipulation of the argument dest_dir causes path traversal. This vulnerability is handled as CVE-2026-43901. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in bx33661 Wireshark-MCP up to 1.1.5. Affected by this vulnerability is the function wireshark_export_objects. The manipulation of the argument dest_dir with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Wireshark MCP is an MCP Server that turns tshark into a structured analysis interface, then layers in optional Wireshark suite utilities. In 1.1.5 and earlier, wireshark-mcp exposes a wireshark_export_objects MCP tool that accepts an attacker-controlled dest_dir parameter and passes it to tshark's --export-objects flag with no mandatory path restriction. The path sandbox (_allowed_dirs) is None by default and only activates when the environment variable WIRESHARK_MCP_ALLOWED_DIRS is explicitly set. In a default installation, any directory on the filesystem can be used as the export destination.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-43901 since 05/04/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/12/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Packet Analyzer Software

Vendor

• bx33661

Name

• Wireshark-MCP

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5

Website

• Product: https://github.com/bx33661/Wireshark-MCP/

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