#VU121279 Deserialization of Untrusted Data in Azure Core shared client library for Python - CVE-2026-21226

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Main Vulnerability Database Vulnerabilities #VU121279

#VU121279 Deserialization of Untrusted Data in Azure Core shared client library for Python - CVE-2026-21226

Published: January 13, 2026


Vulnerability identifier: #VU121279
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-21226
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Azure Core shared client library for Python
Software vendor:
Microsoft

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data in Azure Core shared client library for Python. A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Remediation

Install updates from vendor's website.

External links