CVE-2026-85880 Microsoft Windows Heap-Based Buffer Overflow
A heap-based buffer overflow in Windows ALPC allows an authorized local attacker to elevate privileges.
- Exploited in the wild
- Since 8 Sep 2026
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85880?
CVE-2026-85880 is a high-severity memory corruption vulnerability in Microsoft Windows 10 1607, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Which versions are affected by CVE-2026-85880?
It affects 8 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows Server 2012, Microsoft Windows Server 2016 and 2 more.
How do I fix CVE-2026-85880?
No fix has been published for CVE-2026-85880 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 22 Sep 2026.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-85880 being exploited?
Yes. Attackers have exploited CVE-2026-85880 in the wild since at least 8 Sep 2026.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-96fm-jjf3-wv64.