PT-2026-53444 · Pypi · Horovod

Published 2026-06-29 · Updated 2026-06-29

OSV

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Horovod versions up to and including v0.28.1 are vulnerable to unauthenticated remote code execution. The vulnerability is due to improper handling of base64-encoded data in the ElasticRendezvousHandler, a subclass of KVStoreHandler. Specifically, the put value method in ElasticRendezvousHandler calls codec.loads base64(value), which eventually invokes cloudpickle.loads(decoded). This allows an attacker to send a malicious pickle object via a PUT request, leading to arbitrary code execution on the server.

Fix

Related Identifiers

PYSEC-2026-355

Affected Products

Horovod

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2024-10190 · Security Note
• https://osv.dev/vulnerability/PYSEC-2026-355 · Vendor Advisory
• https://github.com/horovod/horovod · Note
• https://github.com/advisories/GHSA-mrhh-3ggq-23p2 · Note
• https://pypi.org/project/horovod · Note
• https://huntr.com/bounties/3e398d1f-70c2-4e05-ae22-f5d66b19a754 · Note