CVE-2026-21226

Name: CVE-2026-21226
Creator: NVD / NIST
Published: 2026-01-13T19:16:23.987+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.78%

Last modified Jun 17, 2026

CVE-2026-21226 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.. EPSS estimates a 0.78% chance of exploitation in the next 30 days.

Description

Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.78%

51.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Microsoft	Azure Core Shared Client Library	>= 1.1.0, < 1.38.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226Vendor Advisory

Timeline

Published: Jan 13, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21226?

Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.

How severe is CVE-2026-21226?

CVE-2026-21226 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.78% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21226?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21226?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST