CVE-2026-57516: Anyscale Ray

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• Anyscale Ray: before 2.56.0 (fixed in 2.56.0)

Published 2026-07-01. Last modified 2026-10-08.