CVE-2026-57516High· 8.8▾ TwilightA flaw was found in Ray. This unsafe deserialization vulnerability in the WebDataset reader allows a remote attacker to achieve arbitrary code execution. By supplying a specially crafted malicious tar archive to the read_webdataset() funct…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.2 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 13.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.5%
0.5% → 0.9%
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high → none
— → 8.8
none → high
8.8 → —
high → none
— → 8.8
none → high
8.8 → —
high → none
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Last analysed / modified upstream
A flaw was found in Ray. This unsafe deserialization vulnerability in the WebDataset reader allows a remote attacker to achieve arbitrary code execution. By supplying a specially crafted malicious tar archive to the read_webdataset() function, an attacker can trigger the unconditional deserialization of .pkl/.pickle or .pt/.pth entries, leading to the execution of arbitrary code within Ray remote workers.
ray: Ray: Remote code execution via unsafe deserialization in WebDataset reader — rated Important by Red Hat. Released 2026-07-01, updated 2026-09-21.
Affected:
Fixed:
No fix planned:
Not affected:
For more information visit https://access.redhat.com/errata/RHSA-2026:61627 https://access.redhat.com/errata/RHSA-2026:61627 For more information visit https://access.redhat.com/errata/RHSA-2026:68699 https://access.redhat.com/errata/RHSA-2026:68699
Workarounds / mitigations:
read_webdataset() function. Implement strict access controls and input validation for data ingestion pipelines that interact with Ray's WebDataset reader to prevent the introduction of malicious archives.Affected packages:
ray < 2.56.0Patched in:
ray 2.56.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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