PT-2026-54884 · Anyscale · Ray

Alexchenai + 6 · Published 2026-07-01 · Updated 2026-07-01 · CVE-2026-57516

Mitre

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Exploit

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-57516

Affected Products

Ray

References · 6

• 🔥 https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 · Exploit
• https://github.com/ray-project/ray/pull/63470 · Patch
• https://github.com/ray-project/ray/pull/63469 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-57516 · Security Note
• https://github.com/ray-project/ray/releases/tag/ray-2.56.0 · Note
• https://vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-reader · Note