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Advisory record · GHSA-mf8f-x4r3-jm8c

Horovod contains an insecure deserialization vulnerability in its KVStore HTTP server component

CVSS 9.8 CriticalCriticalEPSS 0.0069 · 53rd percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 12 May 2026, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
horovodPyPI<=0.28.1No fixed version yet
Identifiers
GHSA-mf8f-x4r3-jm8c · CVE-2026-31234 · PYSEC-2026-354
Weakness (CWE)
CWE-502
Tags
Published
12 May 2026
Updated
27 Oct 2026

Machine-written summary

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

Horovod versions through 0.28.1 on PyPI have an insecure deserialization flaw (CWE-502) in the KVStore HTTP server component. The KVStore server has no authentication or authorization, so a remote attacker with network access can write data over HTTP, and workers that later read that data deserialize it without checking its source, which can lead to remote code execution. No fixed version is listed in the source.

Written 31 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
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0069, the 53rd percentile, on 11 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.