Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to gather information specific to the environment of the targeted component.
According to the CVSS metric, privileges required is low (PR:L) but the attack occurs remotely. What does that mean for this vulnerability?
To exploit this vulnerability, an attacker would be required change a valid token to be malicious to the service/app which would require developer-type authorization.
Security updates
1.38.0 — https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/core/azure-core/CHANGELOG.md#1380-2026-01-08
Vulnerabilities 1
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High 7.5
Azure Core shared client library for Python Remote Code Execution Vulnerability
Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-21226 Azure Core shared client library for Python Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss