# CVE-2026-122194

Network-based remote code execution in Microsoft Defender

- Page: https://www.vulneraibility.com/cve/CVE-2026-122194
- CVSS: 8.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.79% (percentile 56.7)
- CISA SSVC: exploitation none, automatable no, technical impact total (assessed 2026-11-10)
- Weakness: CWE-476
- Published: 2026-11-10

## Affected versions

- Microsoft Microsoft Malware Protection Engine: affected >= 1.1.0.0 and < 1.1.26100.4

A version outside these ranges is not a statement that it is unaffected.

## Impact

Remote code execution via null pointer dereference in Microsoft Defender, allowing attackers to run arbitrary code on affected Windows endpoints.

## Action

Immediate action required

## Recommendation

Install Microsoft update for CVE-2026-122194 immediately; isolate and monitor affected endpoints.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-122194

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.