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VulnerabilityPublished

ZDI-26-849: Microsoft Qlib RestrictedUnpickler Deserialization of Untrusted Data Remote Code Execution Vulnerability

Source Zero Day Initiative

0
Severity
High

Rated High by Zero Day Initiative

Data as of 2 Nov 2026, 22:15 UTC

What to do

Description

A remote code execution vulnerability exists in Microsoft Qlib due to unsafe deserialization in the RestrictedUnpickler component. Exploitation requires user interaction, such as visiting a malicious webpage or opening a malicious file. The vulnerability has a high severity rating with a CVSS score assigned by ZDI as 7.8.

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