MONAI before 1.6.0 Remote Code Execution via NumpyReader

published 2026-08-18 2 mo ago modified 2026-10-01 39 d ago also EUVD-2026-87843 , GHSA-wg9g-w2j2-8pgr , PYSEC-2026-4020

cvss: 7.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits: 0; none known

MONAI before 1.6.0 contains an unsafe deserialization vulnerability in the NumpyReader class that unconditionally uses numpy.load with allow_pickle=True when loading .npy and .npz files. Attackers can craft malicious .npy files with pickle payloads that execute arbitrary code when loaded through MONAI's standard data pipeline.

Patch / fix

fixed in 2 links 2

pypi monai 1.6.0
Project-MONAI MONAI 1.6.0

github.com/Project-MONAI/MONAI#8875 pull request
github.com/Project-MONAI/MONAI/releases/tag/1.6.0 release

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 42 d ago (2026-09-28)

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-wg9g-w2j2-8pgr referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.5	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
GitHub	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	4.0	8.5	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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

Affected packages

ecosystem	package	affected	fixed in
pypi	monai	<1.6.0	1.6.0

Affected products

Project-MONAI MONAI

Classification

Weakness

CWE-502 Deserialization of Untrusted Data

References

github.com /Project-MONAI/MONAI/pull/8875
web
github.com /Project-MONAI/MONAI/security/advisories/GHSA-wg9g-w2j2-8pgr
vendor-advisory, exploit, web, evidence
vulncheck.com /advisories/monai-before-1.6.0-remote-code-execution-via-numpyreader
third-party-advisory, advisory
github.com /Project-MONAI/MONAI
package
github.com /Project-MONAI/MONAI/releases/tag/1.6.0
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary