CVE-2026-57516: Ray prior to 2.56.0 contains an unsafe deserialization vulnerability in the WebDataset reader that allows atta

Q: How do I fix CVE-2026-57516?

ray: upgrade to 2.56.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-57516 being exploited?

CVE-2026-57516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-57516 affect?

CVE-2026-57516 affects ray. Severity is high (CVSS 8.8). 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_decode

Q: How urgent is CVE-2026-57516?

Priority 50/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-57516 is a high-severity flaw (CVSS 8.8) affecting ray. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 i

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 42%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-07-01
Last modified	2026-10-25

Publisher (CNA): VulnCheck · Vendor: anyscale

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-01 17:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

anyscale ray UPGRADE

Affected: < 2.56.0

Fixed in: 2.56.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ray || rpm -q ray || ray --version

2. UPGRADE to 2.56.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ray

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ray

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57516?

ray: upgrade to 2.56.0. Exact commands for each OS are on this page.

Is CVE-2026-57516 being exploited?

CVE-2026-57516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57516 affect?

CVE-2026-57516 affects ray. Severity is high (CVSS 8.8). 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_decode

How urgent is CVE-2026-57516?

Priority 50/100. High severity; Public exploit reference

References

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