CVE-2026-57516

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 61% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.8
EG Score
8.8(medium)
EPSS
39.0%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated Jul 1, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_pr.
github Patch Available🟡 PoC Available

Arbitrary code execution via ray.data.read_webdataset default decoder: pickle.loads(value) and torch.load(weights_only=False) · Advisory · ray-project/ray · GitHub

Affected: 2.55.0): standard

https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43
generic

Ray < 2.56.0 Unsafe Deserialization RCE via WebDataset Reader | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-reader
github_release Patch Available

Ray-2.56.0

Patch available: ray-project/ray ray-2.56.0

https://github.com/ray-project/ray/releases/tag/ray-2.56.0
github_pr

[Data] Block pickle object columns when reading untrusted Parquet files

Fix merged in ray-project/ray PR #63470 on 2026-05-19 — awaiting tagged release

https://github.com/ray-project/ray/pull/63470
github_pr

[Data] Gate unsafe deserialization in WebDataset default decoder

Fix merged in ray-project/ray PR #63469 on 2026-05-19 — awaiting tagged release

https://github.com/ray-project/ray/pull/63469

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
ray0.1.1 ... 2.9.3 (128 versions)2.56.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 54× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 21:52 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 09:47 UTCEG score recompute
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-14 21:41 UTCEG score recompute
  8. 2026-07-14 09:35 UTCEG score recompute
  9. 2026-07-13 22:31 UTCEPSS rescore
  10. 2026-07-13 21:28 UTCEG score recompute
  11. 2026-07-13 09:23 UTCEG score recompute
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-12 21:18 UTCEG score recompute
  15. 2026-07-12 09:12 UTCEG score recompute
  16. 2026-07-12 05:46 UTCEPSS rescore
  17. 2026-07-11 21:06 UTCEG score recompute
  18. 2026-07-11 09:00 UTCEG score recompute
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-11 08:27 UTCEPSS rescore
  21. 2026-07-10 20:55 UTCEG score recompute
  22. 2026-07-10 08:50 UTCEG score recompute
  23. 2026-07-09 20:42 UTCEG score recompute
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-09 19:10 UTCEPSS rescore
Show 29 more
  1. 2026-07-09 08:37 UTCEG score recompute
  2. 2026-07-08 20:29 UTCEG score recompute
  3. 2026-07-08 15:16 UTCEPSS rescore
  4. 2026-07-08 15:16 UTCEPSS rescore
  5. 2026-07-08 08:24 UTCEG score recompute
  6. 2026-07-07 20:20 UTCEG score recompute
  7. 2026-07-07 13:46 UTCEPSS rescore
  8. 2026-07-07 13:46 UTCEPSS rescore
  9. 2026-07-07 08:14 UTCEG score recompute
  10. 2026-07-06 20:08 UTCEG score recompute
  11. 2026-07-06 16:27 UTCEPSS rescore
  12. 2026-07-06 16:27 UTCEPSS rescore
  13. 2026-07-06 08:00 UTCEG score recompute
  14. 2026-07-06 02:23 UTCEPSS rescore
  15. 2026-07-06 02:23 UTCEPSS rescore
  16. 2026-07-05 19:54 UTCEG score recompute
  17. 2026-07-05 07:47 UTCEG score recompute
  18. 2026-07-05 02:31 UTCEPSS rescore
  19. 2026-07-05 02:30 UTCEPSS rescore
  20. 2026-07-04 19:41 UTCEG score recompute
  21. 2026-07-04 07:36 UTCEG score recompute
  22. 2026-07-04 06:31 UTCEPSS rescore
  23. 2026-07-04 06:31 UTCEPSS rescore
  24. 2026-07-03 19:29 UTCEG score recompute
  25. 2026-07-03 07:23 UTCEG score recompute
  26. 2026-07-02 19:18 UTCEG score recompute
  27. 2026-07-02 07:13 UTCEG score recompute
  28. 2026-07-01 19:08 UTCEG score recompute
  29. 2026-07-01 19:07 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-57516?
CVE-2026-57516 is a high vulnerability published on July 1, 2026. 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 readwebdataset() function. The defaultdecoder() function in webdatasetdatasource.py unconditionally calls…
When was CVE-2026-57516 disclosed?
CVE-2026-57516 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57516 actively exploited?
CVE-2026-57516 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-57516?
CVE-2026-57516 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-57516?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57516, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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