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CVE-2026-57516

Anyscale Ray remote code execution

8.8 HIGHPublic exploitEPSS 0.86%
  1. Published1 Jul 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Anyscale Ray< 2.56.0

Remediation

Fixed in
Anyscale Ray≥ 2.56.0

References

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Frequently asked

Is CVE-2026-57516 being actively exploited?

CVE-2026-57516 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.86%.

How severe is CVE-2026-57516?

CVE-2026-57516 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.86% probability of exploitation.

Which products are affected by CVE-2026-57516?

Affected products include Anyscale Ray.

How do I fix CVE-2026-57516?

Upgrade affected software to a fixed version, for example Anyscale Ray 2.56.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.