CVE-2026-122194: Microsoft Defender null pointer dereference remote code execution

CVE-2026-122194 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Defender, a security tool that protects systems from malware and threats, contains a null pointer dereference vulnerability. An attacker on a network can exploit this flaw to execute arbitrary code on affected systems without needing valid credentials, potentially compromising the security of protected endpoints.

Technologies: Microsoft Defender. Vendors: Microsoft.

Quick answers

Is CVE-2026-122194 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-122194 being exploited in the wild.
How severe is CVE-2026-122194?
High severity, with a CVSS score of 8.8, published 10 November 2026.
Which products and versions are affected?
Microsoft Defender.
Is there a fix for CVE-2026-122194?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-122194 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-122194?
Check whether you run Microsoft Defender. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A null pointer dereference in Microsoft Defender can be triggered remotely by an unauthenticated attacker, leading to code execution. The vulnerability requires network access but no user interaction or prior authentication. Successful exploitation grants the attacker arbitrary code execution on the affected system.

Affected products

  • Microsoft Defender

Timeline

  • 2026-11-10: disclosed

References

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