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. 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 v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/ray-project/ray/pull/63469	Issue Tracking Patch
https://github.com/ray-project/ray/pull/63470	Issue Tracking Patch
https://github.com/ray-project/ray/releases/tag/ray-2.56.0	Product Release Notes
https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43	Exploit Mitigation Patch Vendor Advisory
https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-reader	Third Party Advisory
https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43	Exploit Mitigation Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:anyscale:ray:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-01 17:16

Updated : 2026-07-14 22:17

NVD link : CVE-2026-57516

Mitre link : CVE-2026-57516

CVE.ORG link : CVE-2026-57516

JSON object : View

Products Affected

anyscale

ray

CWE

CWE-502

Deserialization of Untrusted Data

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