RayPublished 1 Jul 2026NVD status: Analyzed

CVE-2026-57516

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.

ComponentRay
Severityhigh (CVSS 8.8)
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published (NVD)2026-07-01
Last modified2026-10-08
Affected versions
< 2.56.0
Fixed in2.56.0
WeaknessCWE-502
CISA KEVnot listed

NVD 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.

What to do

  • Upgrade Ray to 2.56.0 or later.
  • Do not expose the component's API or UI to the internet without authentication in front of it.

Sources