Deserialization in Project-Monai Monai
CVE-2026-100841
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.
Vulnerability class: Insecure Deserialization
Published .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Project-Monai Monai — versions 1.6.0
Weakness classification (CWE)
References
- github.com/Project-MONAI/MONAI/security/advisories/GHSA-636w-j999-g7x5 (vendor-advisory)
- www.vulncheck.com/advisories/monai-1.6.0-persistentdataset-remote-code-executio… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100841?
- CVE-2026-100841 is a high-severity vulnerability in Project-Monai Monai, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2026-09-27.
- How severe is CVE-2026-100841?
- High severity. CVSS v3 base score is 7.8 out of 10.