CVE-2026-57516
Ray < 2.56.0 Unsafe Deserialization RCE via WebDataset Reader
Description
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.
INFO
Published Date :
July 1, 2026, 5:16 p.m.
Last Modified :
July 14, 2026, 10:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Ray to version 2.56.0 or later.
- Avoid processing untrusted tar archives.
- Sanitize input data before processing.
- Review deserialization practices.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-57516.
| URL | Resource |
|---|---|
| https://github.com/ray-project/ray/pull/63469 | Issue Tracking Patch |
| https://github.com/ray-project/ray/pull/63470 | Issue Tracking Patch |
| https://github.com/ray-project/ray/releases/tag/ray-2.56.0 | Product Release Notes |
| https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 | Exploit Mitigation Patch Vendor Advisory |
| https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-reader | Third Party Advisory |
| https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 | Exploit Mitigation Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-57516 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-57516
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-57516 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-57516 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/ray-project/ray', 'vendor': 'Anyscale, Inc', 'product': 'Ray', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.56.0', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] [{'repo': 'https://github.com/ray-project/ray', 'vendor': 'Anyscale, Inc', 'product': 'Ray', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.56.0', 'versionType': 'semver'}], 'packageURL': 'pkg:github/ray-project/ray', 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Jul. 06, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:anyscale:ray:*:*:*:*:*:*:*:* versions up to (excluding) 2.56.0 Added Reference Type VulnCheck: https://github.com/ray-project/ray/pull/63469 Types: Issue Tracking, Patch Added Reference Type VulnCheck: https://github.com/ray-project/ray/pull/63470 Types: Issue Tracking, Patch Added Reference Type VulnCheck: https://github.com/ray-project/ray/releases/tag/ray-2.56.0 Types: Product, Release Notes Added Reference Type VulnCheck: https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 Types: Exploit, Mitigation, Patch, Vendor Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-reader Types: Third Party Advisory Added Reference Type CISA-ADP: https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 Types: Exploit, Mitigation, Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 01, 2026
Action Type Old Value New Value Added Reference https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 Added SSVC {'id': 'CVE-2026-57516', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-01T17:53:01.380220Z'} -
New CVE Received by [email protected]
Jul. 01, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/ray-project/ray', 'vendor': 'Anyscale, Inc', 'product': 'Ray', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.56.0', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-502 Added Reference https://github.com/ray-project/ray/pull/63469 Added Reference https://github.com/ray-project/ray/pull/63470 Added Reference https://github.com/ray-project/ray/releases/tag/ray-2.56.0 Added Reference https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43 Added Reference https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-reader