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Advisory record · GHSA-mw6r-2hvm-4rp2

qwed-mcp has Unsafe SymPy `parse_expr()` Remote Code Execution via Unsanitized Math Expression Input

CVSS 9.8 CriticalCriticalEPSS 0.0073 · 54th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 25 Aug 2026, 15:26 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
qwed-mcpPyPI<0.2.10.2.1
Identifiers
GHSA-mw6r-2hvm-4rp2 · CVE-2026-55546 · PYSEC-2026-3915
Weakness (CWE)
CWE-94
Tags
Published
25 Aug 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The qwed-mcp package before 0.2.1 passes user-supplied strings in its verify_math_expression() function directly to SymPy's parse_expr() without restricting builtins or validating the expression. An attacker who can supply expression input to this function can run arbitrary Python, including OS commands, with the privileges of the running process. The source reports root-level execution in a Docker container, and says the default MCP tool registry in v0.2.0 does not expose this function. Upgrade to qwed-mcp 0.2.1, which fixes the issue.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0073, the 54th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:10 UTC First seen by agentprime
  2. 31 Oct 2026, 14:10 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.