Vulnerability DatabaseCVE-2026-21226
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CVE-2026-21226
January 13, 2026
Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.
Affected Packages
azure-core (PYTHON):
Affected version(s) >=1.0.0b1 <1.38.0
Fix Suggestion:
Update to version 1.38.0
Related Resources (4)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226
https://github.com/Azure/azure-sdk-for-python
https://github.com/Azure/azure-sdk-for-python/blob/6d2e6431ea0991861640e449e51e894247a7771a/sdk/core/azure-core/CHANGELOG.md#1380-2026-01-12
https://nvd.nist.gov/vuln/detail/CVE-2026-21226
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CVSS v4
Base Score:
7.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Exploit Maturity
UNPROVEN
Weakness Type (CWE)
Deserialization of Untrusted Data
CWE-502
EPSS
Base Score:
1.5