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Advisory record · GHSA-xm98-3vcf-fph7

mcp-contextforge-gateway has RestrictedPython sandbox bypass via getattr builtin in python_sandbox_server

CVSS 10.0 CriticalCriticalEPSS 0.011 · 66th percentile

Critical, because:

  • CVSS score 10.0: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 24 Aug 2026, 19:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
mcp-contextforge-gatewayPyPI<1.0.21.0.2
Identifiers
GHSA-xm98-3vcf-fph7 · CVE-2026-53710 · PYSEC-2026-3862
Weakness (CWE)
CWE-94 · CWE-693
Tags
Published
24 Aug 2026
Updated
10 Sept 2026

Machine-written summary

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

Versions of mcp-contextforge-gateway before 1.0.2 contain a sandbox bypass in the python_sandbox_server component, where raw getattr is exposed to RestrictedPython code, allowing arbitrary Python execution. An attacker who can reach the sandbox's HTTP/SSE endpoint without authentication can run operating system commands with the privileges of the server process. Upgrade to version 1.0.2 or later; if the sandbox server cannot be upgraded, do not expose its HTTP transport to untrusted clients.

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
10.0 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.011, the 66th percentile, on 8 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.