CVE-2026-57516
Remote code execution via unsafe deserialization in Ray WebDataset reader (<2.56.0).
Is CVE-2026-57516 being exploited?
Not confirmed. CVE-2026-57516 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.86% probability of exploitation in the next 30 days.
How severe is CVE-2026-57516?
CVE-2026-57516 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-57516?
Yes. A fix has been recorded for CVE-2026-57516. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-57516 affect?
CVE-2026-57516 affects Ray WebDataset reader < 2.56.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57516?
Upgrade Ray to 2.56.0+; review pipelines using WebDataset.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can execute code in Ray workers by processing a malicious tar with .pkl/.pickle or .pt/.pth entries.
Immediate action required
- affected< 2.56.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.