CVE-2026-57516Ray < 2.56.0 Unsafe Deserialization RCE via WebDataset Reader
Updated under an hour ago ()
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It affects Anyscale, Inc Ray. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-502
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Anyscale, Inc Ray anyscale:ray (from the name) | before 2.56.0 | CNA record |
anyscale ray anyscale:ray | before 2.56.0 | NVD |
References
- https://github.com/ray-project/ray/releases/tag/ray-2.56.0release-notes
- https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43vendor-advisory
- https://github.com/ray-project/ray/pull/63469patch, issue-tracking
- https://github.com/ray-project/ray/pull/63470patch, issue-tracking
- https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-readerthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.