CVE-2026-43901
CVE-2026-43901 is a medium-severity vulnerability in Bx33661 Wireshark Mcp with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.
Key facts
- Severity: Medium (CVSS 3.x base score 6.8)
- EPSS exploit prediction: 0% (20th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-29338
- Weakness: CWE-22
- Affected product: Bx33661 Wireshark Mcp
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-43901?
- 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.
- How severe is CVE-2026-43901?
- CVE-2026-43901 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-43901 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-43901?
- CVE-2026-43901 affects Bx33661 Wireshark Mcp. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-43901?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-43901 have an EU (EUVD) identifier?
- Yes. CVE-2026-43901 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29338.
- When was CVE-2026-43901 published?
- CVE-2026-43901 was published on 2026-05-11 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:bx33661:wireshark_mcp:*:*:*:*:*:*:*:*
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