{"answers":{"affected":"1 open source package ship an affected version, including monai. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-100841 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-100841 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-100841 is a high-severity unsafe deserialization vulnerability in Project-MONAI MONAI, published on 27 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-100841 and fix it if it is affected.\n\nWhat it is: CVE-2026-100841 is a high-severity unsafe deserialization vulnerability in Project-MONAI MONAI, published on 27 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-100841 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- monai (PyPI): affected all versions up to 1.6.0-NA; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-100841/ (Markdown: https://insights.sbomify.com/CVE-2026-100841/index.md)","id":"CVE-2026-100841","markdown":"https://insights.sbomify.com/CVE-2026-100841/index.md","name":"CVE-2026-100841","record":{"aliases":["GHSA-636w-j999-g7x5","GHSA-wfpp-6gx5-h8xr","PYSEC-2026-4016"],"analysis":{"component_type":"library","fix_type":"no_fix_stated","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"MONAI Python library","requires_auth":"low_privilege","summary":"A local attacker with write access to the cache directory can execute arbitrary code via malicious pickle files in MONAI's PersistentDataset.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"monai","vendor":"project-monai"}],"cvss":{"score":8.5,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"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 \u003e= 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.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"MONAI through 1.6.0 PersistentDataset Remote Code Execution via Pickle Cache","id":"CVE-2026-100841","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":1,"n_references":2,"next":{"headline":"MONAI through 1.6.0 _get_fake_spatial_shape eval() Sandbox Bypass via Attribute Chains","id":"CVE-2026-100842"},"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["1.6.0-NA"],"package":"monai","purl":"pkg:pypi/monai","source":"PYSEC-2026-4016"}],"prev":{"headline":"MONAI through 1.6.0 Remote Code Execution via bundle configuration","id":"CVE-2026-100840"},"products":["MONAI"],"published":"2026-09-27","related":[{"cvss_score":8.8,"headline":"MONAI before 1.5.2 Remote Code Execution via Pickle Deserialization","id":"CVE-2026-100846","kev_date_added":null,"published":"2026-09-27"},{"cvss_score":8.6,"headline":"MONAI before 1.6.0 OS Command Injection via dataset_name_or_id","id":"CVE-2026-100844","kev_date_added":null,"published":"2026-09-27"},{"cvss_score":8.5,"headline":"MONAI through 1.6.0 Remote Code Execution via bundle configuration","id":"CVE-2026-100840","kev_date_added":null,"published":"2026-09-27"},{"cvss_score":8.5,"headline":"MONAI before 1.6.0 Remote Code Execution via algo_from_pickle","id":"CVE-2026-100843","kev_date_added":null,"published":"2026-09-27"},{"cvss_score":8.5,"headline":"MONAI before 1.6.0 Remote Code Execution via NumpyReader","id":"CVE-2026-100845","kev_date_added":null,"published":"2026-09-27"},{"cvss_score":7.3,"headline":"MONAI through 1.6.0 _get_fake_spatial_shape eval() Sandbox Bypass via Attribute Chains","id":"CVE-2026-100842","kev_date_added":null,"published":"2026-09-27"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-28","vendors":["Project-MONAI"]},"summary":"A local attacker with write access to the cache directory can execute arbitrary code via malicious pickle files in MONAI's PersistentDataset.","url":"https://insights.sbomify.com/CVE-2026-100841/"}