CVE-2026-45584 json
Microsoft Defender Remote Code Execution Vulnerability
published 2026-05-20 5 mo ago modified 2026-08-10 2 mo ago also EUVD-2026-31105
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 58%
- public exploits
- 0
- none known
Summary
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
Patch / fix
- Microsoft Microsoft Malware Protection Engine 1.1.26040.8
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Microsoft Malware Protection Engine
Classification
- Weakness
-
- CWE-122 Heap-based Buffer Overflow
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-45584
vendor-advisory, patch
Sources
- CVE List CVE-2026-45584
- NVD CVE-2026-45584
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.