Azure Core shared client library for Python Remote Code Execution Vulnerability
Priority LOW 37CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 6 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from Microsoft.
Summary
Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0095 61st percentileScored 2026-11-07
Fix Partial Azure Core shared client library for Python (Microsoft): 1.38.0azure-core (PyPI): 1.38.0Red Hat: 6 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Azure Core shared client library for Python | 1.1.0 to before 1.38.0 | 1.38.0 | Patch available | CNA |
| — | azure-core (PyPI) | before 1.38.0 | 1.38.0 | Patch available | GHSA-jm66-cg57-jjv5 |
- Azure Core shared client library for Python VendorMicrosoft Affected 1.1.0 to before 1.38.0 Fixed in 1.38.0 Patch available CNA
- azure-core (PyPI) Vendor— Affected before 1.38.0 Fixed in 1.38.0 Patch available GHSA-jm66-cg57-jjv5
Remediation
- Fix · CNA Azure Core shared client library for Python (Microsoft) Fixed in 1.38.0
- Fix · GHSA-jm66-cg57-jjv5 azure-core (PyPI) Fixed in 1.38.0 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Confidential Compute Attestation | Affected | No fix yet |
| Fence Agents Remediation Operator | Affected | No fix yet |
| Migration Toolkit for Containers | Affected | No fix yet |
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat Quay 3 | Affected | No fix yet |
Not affected: 10 products
- Lightspeed Core
- Migration Toolkit for Applications 8
- OpenShift Lightspeed
- Red Hat AI Inference Server
- Red Hat Ansible Automation Platform 2
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux AI (RHEL AI) 3
- Red Hat OpenShift AI (RHOAI)
Microsoft
Microsoft's page for this CVE →
- Impact
- Remote Code Execution
- Exploited
- No
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
| Product | Status | Plan or fix |
|---|---|---|
| Azure Core shared client library for Python | Fixed | 1.38.0 · Security Update |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-21226
- 2026-10-03 Alias added: GHSA-jm66-cg57-jjv5
- 2026-11-04 Affected versions changed · Red Hat
- 2026-11-04 CVSS score added · Red Hat
References
Sources
- CVE-2026-21226 · CVE Program
- CVE-2026-21226 · NVD
- FIRST EPSS
- GHSA-jm66-cg57-jjv5 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-21226 · Microsoft Security Update Guide
- CVE-2026-21226 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences