GHSA-mf8f-x4r3-jm8c

Suggest an improvement
Source
https://github.com/advisories/GHSA-mf8f-x4r3-jm8c
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-mf8f-x4r3-jm8c/GHSA-mf8f-x4r3-jm8c.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-mf8f-x4r3-jm8c
Aliases
Published
2026-05-12T18:30:40Z
Modified
2026-06-29T12:26:11Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Horovod contains an insecure deserialization vulnerability in its KVStore HTTP server component
Details

Horovod thru 0.28.1 contains an insecure deserialization vulnerability (CWE-502) in its KVStore HTTP server component. The KVStore server, used for distributed task coordination, lacks authentication and authorization controls, allowing any remote attacker to write arbitrary data via HTTP PUT requests. When a Horovod worker reads data from the KVStore (via HTTP GET), it deserializes the data using cloudpickle.loads() without verifying its source or integrity. An attacker can exploit this by sending a malicious pickle payload to the server before the legitimate data is written, causing the victim worker to deserialize and execute arbitrary code, leading to remote code execution.

Database specific 
{
    "cwe_ids":  [
        "CWE-502"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-27T21:45:19Z",
    "nvd_published_at":  "2026-05-12T18:16:51Z",
    "severity":  "CRITICAL"
}
References

Affected packages

PyPI / horovod

Package

Name
horovod
View open source insights on deps.dev
Purl
pkg:pypi/horovod

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Last Affected
0.28.1

Affected versions

0.*
0.9.0
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
0.9.7
0.9.8
0.9.9
0.9.10
0.9.11
0.9.12
0.10.0
0.10.1
0.10.2
0.11.0
0.11.1
0.11.2
0.11.3
0.12.0
0.12.1
0.13.0
0.13.1
0.13.2
0.13.3
0.13.4
0.13.5
0.13.6
0.13.7
0.13.8
0.13.10
0.13.11
0.14.0
0.14.1
0.15.0
0.15.1
0.15.2
0.16.0
0.16.1
0.16.2
0.16.3
0.16.4
0.18.0
0.18.1
0.18.2
0.19.0
0.19.1
0.19.2
0.19.3
0.19.4
0.19.5
0.20.0
0.20.1
0.20.2
0.20.3
0.21.0
0.21.1
0.21.2
0.21.3
0.22.0
0.22.1
0.23.0
0.24.0
0.24.1
0.24.2
0.24.3
0.25.0
0.26.0
0.26.1
0.27.0
0.28.0
0.28.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-mf8f-x4r3-jm8c/GHSA-mf8f-x4r3-jm8c.json"