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Unauthenticated Remote Use-After-Free in Microsoft Windows 11 (version 23H2) Rates 9.8 CVSS

Last refreshed2026-10-15

Status: UPDATED  |  Advisory ID: CVE-2026-100219

Key Details

CVECVE-2026-100219
CVSS Score / Version
9.8 (Critical) / CVSS v3.1
Updated2026-10-14
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Prose
attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products
see table below
Classified as
CWE-416 (Use After Free)
Exploitation prediction (EPSS)
1.00% probability of exploitation in the next 30 days (62% percentile) -- FIRST.org's EPSS model.

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
MicrosoftWindows 11 (version 23H2)
MicrosoftWindows 11 (version 24H2)
MicrosoftWindows 11 (version 25H2)
MicrosoftWindows 11 (version 26H1)
MicrosoftWindows Server 2025
MicrosoftWindows Server 2022
MicrosoftWindows 11 Version 26H2
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

What to Do

Monitor Microsoft's web page for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-100219
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-100219

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