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Advisory record · GHSA-v4p8-mg3p-g94g

LiteLLM: Authenticated command execution via MCP stdio test endpoints

CVSS 8.7 HighCriticalIn CISA KEVEPSS 0.91 · 99th percentile

Critical, because:

  • In CISA’s KEV catalogue since 8 Jun 2026: it is known to be exploited.
  • CVSS score 8.7 (7.0 or more) and EPSS 0.91 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 25 Apr 2026, 23:27 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
litellmPyPI>=1.74.2, <1.83.71.83.7
Identifiers
GHSA-v4p8-mg3p-g94g · CVE-2026-42271 · PYSEC-2026-2599
Weakness (CWE)
CWE-77 · CWE-78
Tags
Published
25 Apr 2026
Updated
10 Sept 2026

Machine-written summary

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

The LiteLLM package (PyPI) versions 1.74.2 up to but not including 1.83.7 are affected. Any authenticated user with a valid proxy API key, including low-privilege internal-user keys, can send a stdio server configuration to the MCP test endpoints and run arbitrary commands on the proxy host with the proxy process's privileges. Upgrade to 1.83.7, which requires the PROXY_ADMIN role for these endpoints; if upgrading is not immediately possible, block the two MCP test endpoints at your reverse proxy or API gateway.

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
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Listed since 8 Jun 2026: known to be exploited.
  • EPSS 0.91, the 99th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 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.