Ray: Arbitrary code execution via ray.data.read_webdataset default decoder: pickle.loads(value) and torch.load(weights_only=False)

Summary ray.data.readwebdatasetpaths=... is a @PublicAPIstability="alpha" reader for WebDataset-format TAR files. Its default decoder=True invokes defaultdecoder on every sample's keys, which routes file extension to a decoder by extension. Two of those branches deserialize attacker-controlled...

PYSEC-2026-2273

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...