Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Anyscale | Ray | < 2.56.0 |
Related Weaknesses (CWE)
References
- https://github.com/ray-project/ray/pull/63469Issue TrackingPatch
- https://github.com/ray-project/ray/pull/63470Issue TrackingPatch
- https://github.com/ray-project/ray/releases/tag/ray-2.56.0ProductRelease Notes
- https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43ExploitMitigationPatch
- https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdatasThird Party Advisory
- https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43ExploitMitigationPatch
FAQ
What is CVE-2026-57516?
CVE-2026-57516 is a vulnerability with a CVSS score of 8.8 (HIGH). 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_we...
How severe is CVE-2026-57516?
CVE-2026-57516 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-57516?
Check the references section above for vendor advisories and patch information. Affected products include: Anyscale Ray.