CVE tracker / CVE-2026-112971
CVE-2026-112971
CVE-2026-112971 is the Windows SMB Client Elevation of Privilege Vulnerability. Microsoft rates it Important, CVSS 7.0. It is not in CISA's Known Exploited Vulnerabilities catalog. Published November 10, 2026.
Risk summary
HighElevation of Privilege
7.0
CVSS v3 base
High
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.”
How to fix it
Microsoft lists 2 affected products and the update that fixes each:
- KB5132059 · fixed build 10.0.28000.3501
Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems
What Microsoft changed
- November 10, 2026: Information published.
Details
- Weakness
- CWE-122: Heap-based Buffer Overflow
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- November 10, 2026
- Last revised
- November 10, 2026
Get told when this changes
Senserva Watch emails Microsoft security and patch alerts when something moves: a new exploitation report, a revised fix, a known issue. Free, one email address.
References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.