CVE-2026-3959
CVE-2026-3959 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. 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-77.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- CVSS v2: 4.3
- CVSS v4: 1.9
- EPSS exploit prediction: 1% (47th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-11478
- Weakness: CWE-77
- Published:
- Last modified:
Description
A vulnerability was found in 0xKoda WireMCP up to 7f45f8b2b4adeb76be8c6227eefb38533fdd6b1e. Impacted is the function server.tool of the file index.js of the component Tshark CLI Command Handler. The manipulation results in os command injection. The attack needs to be approached locally. The exploit has been made public and could be used. This product utilizes a rolling release system for continuous delivery, and as such, version information for affected or updated releases is not disclosed. The project was informed of the problem early through an issue report but has not responded yet.
Frequently asked questions
- What is CVE-2026-3959?
- A vulnerability was found in 0xKoda WireMCP up to 7f45f8b2b4adeb76be8c6227eefb38533fdd6b1e. Impacted is the function server.tool of the file index.js of the component Tshark CLI Command Handler. The manipulation results in os command injection. The attack needs to be approached locally. The exploit has been made public and could be used. This product utilizes a rolling release system for continuous delivery, and as such, version information for affected or updated releases is not disclosed. The project was informed of the problem early through an issue report but has not responded yet.
- How severe is CVE-2026-3959?
- CVE-2026-3959 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2026-3959 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-3959?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-3959 have an EU (EUVD) identifier?
- Yes. CVE-2026-3959 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11478.
- When was CVE-2026-3959 published?
- CVE-2026-3959 was published on 2026-03-11 and last updated on 2026-06-17.
References
- https://github.com/0xKoda/WireMCP/
- https://github.com/0xKoda/WireMCP/issues/12
- https://github.com/user-attachments/files/25571315/WireMCP_security_advisory.pdf
- https://vuldb.com/?ctiid.350389
- https://vuldb.com/?id.350389
- https://vuldb.com/?submit.768129
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