CVE-2026-21226 is a critical deserialization of untrusted data vulnerability in the Azure Core shared client library for Python, allowing an authorized attacker to execute arbitrary code over a network. With a CVSS score of 7.5 (HIGH), this vulnerability has a network attack vector and high impact on confidentiality, integrity, and availability, despite requiring high attack complexity and low privileges. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion and media coverage, indicating high awareness and potential for future exploitation.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 1.1.0, < 1.38.0CPE matchmatch criteria | cpe:2.3:a:microsoft:azure_core_shared_client_library:*:*:*:*:*:python:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.