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CVE-2026-57516— Ray < 2.56.0 Unsafe Deserialization RCE via WebDataset Reader

Quick assessment

Affected
Anyscale, Inc Ray
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ray-project Ray是ray-project组织开源的一个用于扩展 AI 和 Python 应用程序的统一框架。 ray-project ray 2.56.0之前版本存在反序列化漏洞，该漏洞源于WebDataset reader中存在不安全的反序列化，允许攻击者通过向read_webdataset()函数提供恶意tar归档文件实现远程代码执行。

CVSS 8.8 · High EPSS 0.86% · P57

Affected Version Matrix 1

VendorProduct Version RangeStatus
Anyscale, Inc Ray < 2.56.0 affected
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I. Basic Information for CVE-2026-57516

Vulnerability Information
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Vulnerability Title
Ray < 2.56.0 Unsafe Deserialization RCE via WebDataset Reader
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
ray-project ray 反序列化漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ray-project Ray是ray-project组织开源的一个用于扩展 AI 和 Python 应用程序的统一框架。 ray-project ray 2.56.0之前版本存在反序列化漏洞，该漏洞源于WebDataset reader中存在不安全的反序列化，允许攻击者通过向read_webdataset()函数提供恶意tar归档文件实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Anyscale, Inc Ray 0 ~ 2.56.0 -

II. Public POCs for CVE-2026-57516

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III. Intelligence Information for CVE-2026-57516

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Patches & Fixes for CVE-2026-57516 (2)

Vendor Advisories for CVE-2026-57516 (2)

Other References for CVE-2026-57516 (1)

IV. Related Vulnerabilities

Same product: Ray
Same weakness: CWE-502

V. Comments for CVE-2026-57516

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