Vulnerability-Lookup

CVE-2026-43901 (GCVE-0-2026-43901)

Vulnerability from cvelistv5 – Published: 2026-05-11 21:51 – Updated: 2026-05-13 14:38

Title

Wireshark MCP: Arbitrary file write via export_objects when WIRESHARK_MCP_ALLOWED_DIRS is not configured

Summary

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.

Severity

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/bx33661/Wireshark-MCP/security…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
bx33661	Wireshark-MCP	Affected: <= 1.1.5

Show details on NVD website

JSON

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FKIE_CVE-2026-43901

Vulnerability from fkie_nvd - Published: 2026-05-11 23:20 - Updated: 2026-05-13 16:16

Severity

6.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/bx33661/Wireshark-MCP/security/advisories/GHSA-3r68-x3xc-rxpg	Exploit, Mitigation, Patch, Vendor Advisory
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/bx33661/Wireshark-MCP/security/advisories/GHSA-3r68-x3xc-rxpg	Exploit, Mitigation, Patch, Vendor Advisory

Impacted products

	Vendor	Product	Version
	bx33661	wireshark_mcp	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:bx33661:wireshark_mcp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C22F6C9B-ECFE-4450-93A4-C1047D82CD27",
              "versionEndIncluding": "1.1.5",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s --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."
    }
  ],
  "id": "CVE-2026-43901",
  "lastModified": "2026-05-13T16:16:52.987",
  "metrics": {
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          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
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          "confidentialityImpact": "HIGH",
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        "impactScore": 5.2,
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      ],
      "url": "https://github.com/bx33661/Wireshark-MCP/security/advisories/GHSA-3r68-x3xc-rxpg"
    },
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        "Exploit",
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      ],
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    }
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-22"
        }
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      "source": "security-advisories@github.com",
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    }
  ]
}

GHSA-3R68-X3XC-RXPG

Vulnerability from github – Published: 2026-05-05 20:15 – Updated: 2026-05-13 15:20

Summary

wireshark-mcp vulnerable to arbitrary file write via export_objects when WIRESHARK_MCP_ALLOWED_DIRS is not configured

Details

Description

Impact

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.

Affected code (src/wireshark_mcp/tshark/client.py:531-543):


output_validation = self._validate_output_path(dest_dir)

# _validate_output_path only enforces the sandbox when _allowed_dirs is set.

# Default: _allowed_dirs = None → no restriction.

os.makedirs(dest_dir, exist_ok=True)   # creates arbitrary directories

cmd = [..., "--export-objects", f"{protocol},{dest_dir}"]

Attack Scenario

An attacker embeds a crafted HTTP response in a pcap file (e.g. Content-Disposition: filename=authorized_keys). Via prompt injection in the pcap payload, an AI model using this MCP server is manipulated into calling wireshark_export_objects with:


dest_dir=/home/user/.ssh/

tshark then extracts and writes the HTTP object to that path, granting the attacker SSH access.

The same technique can target:

/etc/cron.d/
Writable web roots
Other sensitive filesystem locations

Additional Affected Operations

The same missing sandbox affects:

merge_pcap_files
editcap_trim
editcap_split
editcap_time_shift
editcap_deduplicate
text2pcap_import

Proof of Concept

Confirmed on wireshark-mcp v1.1.5 with tshark 4.6.4.

A crafted pcap’s HTTP object was successfully written to an arbitrary filesystem path when:


_allowed_dirs = None

Patches

Not yet patched.

A fix should make the path sandbox mandatory for all file-write operations rather than optional:


# Reject all write operations when no sandbox is configured

if not self._allowed_dirs:

    return json.dumps({

        "success": False,

        "error": {

            "type": "SecurityError",

            "message": "Set WIRESHARK_MCP_ALLOWED_DIRS before using file-write operations"

        }

    })

Workarounds

Set WIRESHARK_MCP_ALLOWED_DIRS to a restricted safe directory before starting the server:


export WIRESHARK_MCP_ALLOWED_DIRS=/tmp/wireshark_mcp_safe

This activates the existing sandbox and blocks writes outside the allowed path.

Resources

Vulnerable code:
src/wireshark_mcp/tshark/client.py lines 521–543
src/wireshark_mcp/tshark/client.py lines 685–839
CWE-22: Improper Limitation of a Pathname to a Restricted Directory
CWE-73: External Control of File Name or Path

Severity

6.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "wireshark-mcp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-43901"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T20:15:12Z",
    "nvd_published_at": "2026-05-11T23:20:21Z",
    "severity": "MODERATE"
  },
  "details": "## Description\n\n### Impact\n\n`wireshark-mcp` exposes a `wireshark_export_objects` MCP tool that accepts an attacker-controlled `dest_dir` parameter and passes it to tshark\u0027s `--export-objects` flag with **no mandatory path restriction**.\n\nThe 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.\n\n**Affected code** (`src/wireshark_mcp/tshark/client.py:531-543`):\n\n```python\n\noutput_validation = self._validate_output_path(dest_dir)\n\n# _validate_output_path only enforces the sandbox when _allowed_dirs is set.\n\n# Default: _allowed_dirs = None \u2192 no restriction.\n\nos.makedirs(dest_dir, exist_ok=True)   # creates arbitrary directories\n\ncmd = [..., \"--export-objects\", f\"{protocol},{dest_dir}\"]\n\n```\n\n### Attack Scenario\n\nAn attacker embeds a crafted HTTP response in a pcap file (e.g. `Content-Disposition: filename=authorized_keys`). Via prompt injection in the pcap payload, an AI model using this MCP server is manipulated into calling `wireshark_export_objects` with:\n\n```bash\n\ndest_dir=/home/user/.ssh/\n\n```\n\n`tshark` then extracts and writes the HTTP object to that path, granting the attacker SSH access.\n\nThe same technique can target:\n\n- `/etc/cron.d/`\n\n- Writable web roots\n\n- Other sensitive filesystem locations\n\n### Additional Affected Operations\n\nThe same missing sandbox affects:\n\n- `merge_pcap_files`\n\n- `editcap_trim`\n\n- `editcap_split`\n\n- `editcap_time_shift`\n\n- `editcap_deduplicate`\n\n- `text2pcap_import`\n\n### Proof of Concept\n\nConfirmed on **wireshark-mcp v1.1.5** with **tshark 4.6.4**.\n\nA crafted pcap\u2019s HTTP object was successfully written to an arbitrary filesystem path when:\n\n```python\n\n_allowed_dirs = None\n\n```\n\n---\n\n## Patches\n\nNot yet patched.\n\nA fix should make the path sandbox **mandatory** for all file-write operations rather than optional:\n\n```python\n\n# Reject all write operations when no sandbox is configured\n\nif not self._allowed_dirs:\n\n    return json.dumps({\n\n        \"success\": False,\n\n        \"error\": {\n\n            \"type\": \"SecurityError\",\n\n            \"message\": \"Set WIRESHARK_MCP_ALLOWED_DIRS before using file-write operations\"\n\n        }\n\n    })\n\n```\n\n---\n\n## Workarounds\n\nSet `WIRESHARK_MCP_ALLOWED_DIRS` to a restricted safe directory before starting the server:\n\n```bash\n\nexport WIRESHARK_MCP_ALLOWED_DIRS=/tmp/wireshark_mcp_safe\n\n```\n\nThis activates the existing sandbox and blocks writes outside the allowed path.\n\n---\n\n## Resources\n\n- Vulnerable code:\n\n  - `src/wireshark_mcp/tshark/client.py` lines 521\u2013543\n\n  - `src/wireshark_mcp/tshark/client.py` lines 685\u2013839\n\n- CWE-22: Improper Limitation of a Pathname to a Restricted Directory\n\n- CWE-73: External Control of File Name or Path",
  "id": "GHSA-3r68-x3xc-rxpg",
  "modified": "2026-05-13T15:20:15Z",
  "published": "2026-05-05T20:15:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/bx33661/Wireshark-MCP/security/advisories/GHSA-3r68-x3xc-rxpg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43901"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bx33661/Wireshark-MCP"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "wireshark-mcp vulnerable to arbitrary file write via export_objects when WIRESHARK_MCP_ALLOWED_DIRS is not configured"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-43901 (GCVE-0-2026-43901)

FKIE_CVE-2026-43901

GHSA-3R68-X3XC-RXPG

Description

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