7.8
High
Exploited
CVE-2026-85880 Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Ransomware campaigns
Not observed so far
Weakness
CWE-122, CWE-908
Description
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 Version 1607 10.0 | 10.0.14393.0 → < 10.0.14393.9512 | 10.0.14393.9512 |
| Windows 10 Version 1809 10.0 | 10.0.17763.0 → < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows 10 Version 21H2 10.0 | 10.0.19044.0 → < 10.0.19044.7725 | 10.0.19044.7725 |
| Windows 10 Version 22H2 10.0 | 10.0.19045.0 → < 10.0.19045.7725 | 10.0.19045.7725 |
| Windows Server 2012 6.2 | 6.2.9200.0 → < 6.2.9200.26349 | 6.2.9200.26349 |
| Windows Server 2012 (Server Core installation) 6.2 | 6.2.9200.0 → < 6.2.9200.26349 | 6.2.9200.26349 |
| Windows Server 2012 R2 6.3 | 6.3.9600.0 → < 6.3.9600.23398 | 6.3.9600.23398 |
| Windows Server 2012 R2 (Server Core installation) 6.3 | 6.3.9600.0 → < 6.3.9600.23398 | 6.3.9600.23398 |
| Windows Server 2016 10.0 | 10.0.14393.0 → < 10.0.14393.9512 | 10.0.14393.9512 |
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| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Server 2016 (Server Core installation) 10.0 | 10.0.14393.0 → < 10.0.14393.9512 | 10.0.14393.9512 |
| Windows Server 2019 10.0 | 10.0.17763.0 → < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2019 (Server Core installation) 10.0 | 10.0.17763.0 → < 10.0.17763.9245 | 10.0.17763.9245 |
| Windows Server 2022 10.0 | 10.0.20348.0 → < 10.0.20348.5622 | 10.0.20348.5622 |
References
Timeline
- Published
- Added to the KEV catalogue
- Last modified
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