Project-MONAI Cache Helpers monai/data/utils.py pickle.loads deserialization

Summaryinfo

A vulnerability, which was classified as problematic, was found in Project-MONAI MONAI. This vulnerability affects the function pickle.loads of the file monai/data/utils.py of the component Cache Helpers. Executing a manipulation can lead to deserialization. This vulnerability is handled as CVE-2026-100841. It is possible to launch the attack on the local host. There is not any exploit available.

Detailsinfo

A vulnerability was found in Project-MONAI MONAI (affected version not known). It has been declared as problematic. This vulnerability affects the function pickle.loads of the file monai/data/utils.py of the component Cache Helpers. The manipulation with an unknown input leads to a deserialization vulnerability. The CWE definition for the vulnerability is CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In MONAI 1.6.0, PersistentDataset (monai/data/dataset.py) explicitly rejects the combination track_meta=True with weights_only=True, forcing users who cache MetaTensors (the default tensor type in MONAI >= 1.0) to run torch.load(hashfile, weights_only=False). Related cache helpers in monai/data/utils.py also call pickle.loads on cached content and derive cache keys with hashlib.md5. As a result, a local user with write access to a shared or world-writable cache_dir (e.g. /tmp/monai_cache, HPC scratch, ~/.cache/monai) can place a malicious pickle file that is deserialized the next time another user's MONAI pipeline reads the cache, resulting in arbitrary code execution in that user's context. All released versions of the monai pip package are affected; no patched version is available as of the advisory.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-100841 since 09/27/2026. The exploitation appears to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Project Management Software

Vendor

• Project-MONAI

Name

• MONAI

Website

• Product: https://github.com/Project-MONAI/MONAI/

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CPE 2.2info

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