Code Injection Vulnerability in Microsoft Defender for Linux
CVE-2026-21537

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Defender For Endpoint For Linux
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21537?

A code injection vulnerability in Microsoft Defender for Linux allows unauthorized attackers to execute arbitrary code over adjacent networks, potentially compromising system integrity and security. This vulnerability arises due to improper control during the generation of code, making affected systems susceptible to various types of attacks. Organizations using this product should apply the necessary patches and follow best practices for securing their environments.

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Deploy the Patch

Affected Version(s)

Microsoft Defender for Endpoint for Linux 101.0.0 < 1.0.9.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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