Deserialization in Mlflow
CVE-2026-118623
MLflow PickleEvaluationArtifact Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of MLflow. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of pickle files. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-29513.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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
- Mlflow — versions 3.10.1
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-26-839/ (x_research-advisory)
Frequently asked questions
- What is CVE-2026-118623?
- CVE-2026-118623 is a high-severity vulnerability in Mlflow, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2026-11-04.
- How severe is CVE-2026-118623?
- High severity. CVSS v3 base score is 7.8 out of 10.