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CVE-2026-57516

Ray < 2.56.0 Unsafe Deserialization RCE via WebDataset Reader

Published: Jul 1, 2026Updated: Jul 14, 2026 Sources: CVE List NVDCWE-502
8.8HIGH
NVD MITRE
EPSS Score
0.6%
Top 56.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-502

Affected Products

anyscale
commercialaka any scale
raySaaS
AI / ML / ml-framework
Anyscale, Inc
Ray

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

3 techniques
Execution
Initial Access
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References

https://github.com/ray-project/ray/pull/63469
github.com
https://github.com/ray-project/ray/pull/63470
github.com
https://github.com/ray-project/ray/releases/tag/ray-2.56.0
github.com
and 2 more references View all →

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