Azure Core is vulnerable to deserialization of untrusted data
Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | azure-core | < 1.38.0 | 1.38.0 |
References
- https://nvd.nist.gov/vuln/detail/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://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226
- https://pypi.org/project/azure-core
- https://github.com/advisories/GHSA-jm66-cg57-jjv5
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-502- Platform
- Python (PyPI)
- Package
azure-core- Disclosed
- 13.01.2026
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1208 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-jm66-cg57-jjv5 - CC BY 4.0
Vulnerability history: azure-core
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.