CVE-2026-57516
High
Description
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductAnyscale Ray
PublishedJul 1, 2026
First seenJul 1, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- anyscale ray2.56.0 or later
- ray2.56.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| anyscale ray | v < 2.56.0 | 2.56.0 |
| rayPyPI | v < 2.56.0 | 2.56.0 |
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