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Advisory record · GHSA-rwrf-2pqf-9j8j

Model Context Protocol Python SDK: Client fetched server-chosen $ref URLs while validating tool results against output schemas

CVSS 6.5 MediumEPSS 0.0034 · 27th percentile

Published by the GitHub Advisory Database at 27 Oct 2026, 21:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
mcpPyPI>=2.0.0, <2.2.0 || >=1.10.0, <1.30.02.2.0, 1.30.0
Identifiers
GHSA-rwrf-2pqf-9j8j · CVE-2026-116686
Weakness (CWE)
CWE-918
Tags
Published
27 Oct 2026
Updated
27 Oct 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
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0034, the 27th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 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.