{"id":"PYSEC-2026-2273","details":"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.","aliases":["CVE-2026-57516","GHSA-hhrp-gw25-jr43"],"modified":"2026-07-13T07:15:44.097966037Z","published":"2026-07-01T17:16:37.390Z","references":[{"type":"ADVISORY","url":"https://github.com/ray-project/ray/releases/tag/ray-2.56.0"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/ray-unsafe-deserialization-rce-via-webdataset-reader"},{"type":"FIX","url":"https://github.com/ray-project/ray/pull/63469"},{"type":"FIX","url":"https://github.com/ray-project/ray/pull/63470"},{"type":"FIX","url":"https://github.com/ray-project/ray/security/advisories/GHSA-hhrp-gw25-jr43"}],"affected":[{"package":{"name":"ray","ecosystem":"PyPI","purl":"pkg:pypi/ray"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.56.0"}]}],"versions":["0.1.1","0.1.2","0.2.0","0.2.1","0.2.2","0.3.0","0.3.1","0.4.0","0.5.0","0.5.2","0.5.3","0.6.0","0.6.1","0.6.2","0.6.3","0.6.4","0.6.5","0.6.6","0.7.0","0.7.1","0.7.2","0.7.3","0.7.4","0.7.5","0.7.6","0.7.7","0.8.0","0.8.1","0.8.2","0.8.3","0.8.4","0.8.5","0.8.6","0.8.7","1.0.0","1.0.1","1.1.0","1.10.0","1.11.0","1.11.1","1.12.0","1.12.1","1.13.0","1.2.0","1.3.0","1.4.0","1.4.1","1.5.0","1.5.1","1.5.2","1.6.0","1.7.0","1.7.1","1.8.0","1.9.0","1.9.1","1.9.2","2.0.0","2.0.1","2.1.0","2.10.0","2.11.0","2.12.0","2.2.0","2.20.0","2.21.0","2.22.0","2.23.0","2.24.0","2.3.0","2.3.0rc0","2.3.1","2.30.0","2.31.0","2.32.0","2.32.0rc0","2.33.0","2.34.0","2.35.0","2.36.0","2.36.1","2.37.0","2.38.0","2.39.0","2.4.0","2.40.0","2.41.0","2.42.0","2.42.1","2.43.0","2.44.0","2.44.1","2.45.0","2.46.0","2.47.0","2.47.1","2.48.0","2.49.0","2.49.1","2.49.2","2.5.0","2.5.1","2.50.0","2.50.1","2.51.0","2.51.1","2.51.2","2.52.0","2.52.1","2.53.0","2.54.0","2.54.1","2.55.0","2.55.1","2.6.0","2.6.1","2.6.2","2.6.3","2.7.0","2.7.0rc0","2.7.1","2.7.2","2.8.0","2.8.1","2.9.0","2.9.1","2.9.2","2.9.3"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/ray/PYSEC-2026-2273.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/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"}]}