SB20261111124 - NULL pointer dereference in Microsoft Malware Protection Engine
Published: November 11, 2026
Security Bulletin ID
SB20261111124
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-122194)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a null pointer dereference in Microsoft Defender when processing input delivered over a network. A remote attacker can trigger the flaw over a network, with user interaction required, to execute arbitrary code.
Remediation
Install update from vendor's website.