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.
CVE ID: CVE-2024-10190
CVSS Base Severity: CRITICAL
CVSS Base Score: 9.8
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor: horovod
Product: horovod/horovod
EPSS Score: 0.5% (probability of being exploited)
EPSS Percentile: 64.53% (scored less or equal to compared to others)
EPSS Date: 2025-04-18 (when was this score calculated)