Vulnerability · Published Jan 13, 2026 · Assigned by microsoft
CVE-2026-21226Azure Core shared client library for Python Remote Code Execution Vulnerability
High 7.5
In plain English
A high-severity unsafe deserialization in Azure Core shared client library for Python from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.9%top 38.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | azure-core | 1.38.0 | GHSA-jm66-cg57-jjv5 |
| PyPI | azure-core | 1.38.0 | PYSEC-2026-1208 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Azure Core shared client library for Python | 1.1.0 – before 1.38.0 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Azure Core shared client library for Python Remote Code Execution Vulnerability vendor-advisory, patch