---
id: "CVE-2026-112794"
page: "https://infrastack.ai/live/CVE-2026-112794"
kind: "vulnerability"
aliases: ["CVE-2026-112794"]
title: "Windows Smart Card: heap overflow lets a local user gain higher privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows Smart Card", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "Windows 10/11 and Windows Server (Smart Card)", "fixed": ["10.0.14393.9688", "10.0.17763.9487", "10.0.19044.7846", "10.0.19045.7846", "10.0.22631.7711", "10.0.26100.9974", "10.0.26200.9974", "10.0.28000.3501", "10.0.26300.9974", "10.0.20348.5870", "10.0.26100.33822"], "affected": "Win10 1607 < 10.0.14393.9688; 1809 < 10.0.17763.9487; 21H2 < 10.0.19044.7846; 22H2 < 10.0.19045.7846; Win11 23H2 < 10.0.22631.7711; 24H2 < 10.0.26100.9974; 25H2 < 10.0.26200.9974; 26H1 < 10.0.28000.3501; 26H2 < 10.0.26300.9974; Server 2022 < 10.0.20348.5870; Server 2025 < 10.0.26100.33822", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["infrastructure", "local-privilege-escalation", "smart-card", "windows", "windows-server"]
not_affected_if: ["no-local-untrusted-users", "patched-build"]
published_at: "2026-11-10T19:18:41+00:00"
first_seen_at: "2026-11-10T19:24:33+00:00"
updated_at: "2026-11-11T00:07:14+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112794", "first_seen_at": "2026-11-10T19:24:33+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112794", "first_seen_at": "2026-11-11T00:07:14+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-112794"]}]
exploit_sources: []
---

# Windows Smart Card: heap overflow lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-112794 (this .md is for agents)

A heap-based buffer overflow in the Windows Smart Card component lets a logged-in attacker corrupt memory and elevate their privileges on the machine. The sources rate it high severity (CVSS 7.8) and report no known exploitation.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Windows Smart Card affected range not listed fixed no fixed version listed
- vendor:Windows 10/11 and Windows Server (Smart Card) affected Win10 1607 < 10.0.14393.9688; 1809 < 10.0.17763.9487; 21H2 < 10.0.19044.7846; 22H2 < 10.0.19045.7846; Win11 23H2 < 10.0.22631.7711; 24H2 < 10.0.26100.9974; 25H2 < 10.0.26200.9974; 26H1 < 10.0.28000.3501; 26H2 < 10.0.26300.9974; Server 2022 < 10.0.20348.5870; Server 2025 < 10.0.26100.33822 fixed 10.0.14393.9688, 10.0.17763.9487, 10.0.19044.7846, 10.0.19045.7846, 10.0.22631.7711, 10.0.26100.9974, 10.0.26200.9974, 10.0.28000.3501, 10.0.26300.9974, 10.0.20348.5870, 10.0.26100.33822

## How to check

Run winver or [System.Environment]::OSVersion / 'cmd /c ver' and compare the full build (e.g. 10.0.26100.xxxx) with the fixed build for your Windows version; lower means exposed. Mainly matters where untrusted users can log in locally.

## Fix

Install the November 2026 Windows cumulative update that brings the OS build to at least: Win10 1607/Server 2016 10.0.14393.9688; Win10 1809/Server 2019 10.0.17763.9487; Win10 21H2 10.0.19044.7846; Win10 22H2 10.0.19045.7846; Win11 23H2 10.0.22631.7711; Win11 24H2 10.0.26100.9974; Win11 25H2 10.0.26200.9974; Win11 26H1 10.0.28000.3501; Win11 26H2 10.0.26300.9974; Server 2022 10.0.20348.5870; Server 2025 10.0.26100.33822. KB numbers: see the MSRC page.

## Timeline

- 2026-11-10T19:24:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112794
- 2026-11-11T00:07:14+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-112794 — Affected/fixed builds from Microsoft CNA data mirrored on NVD; MSRC page unreadable by tools so KB numbers unknown and nothing marked verified.

## Documents

- [advisory] NVD CVE-2026-112794 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/CVE-2026-112794

## From the sources

Heap-based buffer overflow in Windows Smart Card allows an authorized attacker to elevate privileges locally.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_