CVE-2026-21531
Azure SDK for Python Remote Code Execution Vulnerability
CVSS v3
9.8
CRITICAL
EPSS Score
2.4 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
none
SSVC status
Description
Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.
Technical details
- Published
- 2026-02-10
- Last Modified
- 2026-02-12
Frequently asked questions
What is CVE-2026-21531?
Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.
Is CVE-2026-21531 actively exploited?
Active exploitation of CVE-2026-21531 has not been confirmed. Its EPSS score was 2.4% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-21531?
CVE-2026-21531 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2026-21531 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.
No credit card required · 500 free checks/month · Free API key
Other 2026 vulnerabilities worth triaging
Ranked by exploit probability (EPSS).
- CVE-2026-10520KEV
- CVE-2026-24061KEV
- CVE-2026-1281KEV
- CVE-2026-41940KEV
- CVE-2026-1340KEVUnauthenticated Remote Code Execution via Code Injection in Ivanti Endpoint Manager Mobile
- CVE-2026-23760KEVSmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API
- CVE-2026-21643KEVSQL Injection Vulnerability in FortiClientEMS 7.4.4 Allows Unauthenticated Remote Code Execution
- CVE-2026-20182KEV