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Vulnerability record · CVE-2026-57516 · published 1 July 2026

CVE-2026-57516: Anyscale ray deserialization of untrusted data vulnerability

Anyscale · Ray

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.

8.6 CVSS 4.0 High EPSS 0.86% · top 43.2% CWE-502 · Deserialization of untrusted data
8.6CVSS 4.0 base score
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
14 Jul 2026Last modified by 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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/ray-project/ray/pull/63469 Issue TrackingPatch
https://github.com/ray-project/ray/pull/63470 Issue TrackingPatch
https://github.com/ray-project/ray/releases/tag/ray-2.56.0 ProductRelease Notes
https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 ExploitMitigationPatchVendor 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 ExploitMitigationPatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-57516), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.