CVE-2026-100219

Microsoft Windows 11 23h2: use-after-free

Risk score: 86/100
CVSS: 9.8 v3.1
Exploit chance (30 days): 1.0%
Published: 13 Oct 2026

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What to know

What it is: Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Affected: Microsoft Windows 11 23h2
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Red

CVSS 9.8 critical
Remotely exploitable without logging in
On your watchlist: windows server

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-100219

Original description

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

Last activity 13 Oct 2026. Patch Forecast updates every hour.