CVE-2026-57516
Ray < 2.56.0 Unsafe Deserialization RCE via WebDataset Reader
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
Ray prior to 2.56.0 contains an unsafe deserialization vulnerability in the WebDataset reader that allows attackers to achieve remote code execution by supplying a malicious tar archive to the read_webdataset() function. The _default_decoder() function in webdataset_datasource.py unconditionally calls pickle.loads() on tar entries with .pkl/.pickle extensions and torch.load() with weights_only=False on .pt/.pth entries, executing arbitrary code inside Ray remote workers on every worker that processes the malicious archive.
| CWE | CWE-502 |
| Vendor | anyscale, inc |
| Product | ray |
| Published | Jul 1, 2026 |
| Last Updated | Jul 1, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Anyscale, Inc / Ray
0 < 2.56.0
References
github.com: https://github.com/ray-project/ray/releases/tag/ray-2.56.0 github.com: https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 github.com: https://github.com/ray-project/ray/pull/63469 github.com: https://github.com/ray-project/ray/pull/63470 vulncheck.com: https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-reader
Credits
jeremysommerfeld8910-cpu 🔍 shakevsky 🔍 alexchenai 🔍 SSJCorpSec 🔍 thesecguy45 🔍 sfwani 🔍 Rahul Karne