MCP Calculate Server: Prompt Injection to RCE

published 2026-05-15 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-30574

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits: 0; none known

MCP Calculate Server is a mathematical calculation service based on MCP protocol and SymPy library. Prior to 0.1.1, the use of eval() to evaluate mathematical expressions without proper input sanitization leads to remote code execution. This vulnerability is fixed in 0.1.1.

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 5 mo ago (2026-05-15)

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

611711Dark mcp_calculate_server

Classification

Weakness

CWE-94 Improper Control of Generation of Code
CWE-1427 Improper Neutralization of Input Used for LLM Prompting

References

github.com /611711Dark/mcp_calculate_server/security/advisories/GHSA-2mgq-7rfg-rwpj

Sources

CVE List CVE-2026-44717
NVD CVE-2026-44717

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary