MicrosoftCVE-2026-50340

Microsoft Windows Runtime: use after free

High8.5CVE-2026-50340 · Published Jul 14, 2026 · updated Jul 22, 2026

Use after free in Windows Runtime allows an authorized attacker to elevate privileges over a network.

Microsoft advisory

Affected versions

Package	Affected	Fixed in
Windows 11 Version 24H2 Product	>= 10.0.26100.0, < 10.0.26100.8875	10.0.26100.8875
Windows 11 Version 25H2 Product	>= 10.0.26200.0, < 10.0.26200.8875	10.0.26200.8875
Windows 11 version 26H1 Product	>= 10.0.28000.0, < 10.0.28000.2525	10.0.28000.2525
Windows Server 2025 Product	>= 10.0.26100.0, < 10.0.26100.33158	10.0.26100.33158
Windows Server 2025 (Server Core installation) Product	>= 10.0.26100.0, < 10.0.26100.33158	10.0.26100.33158

Details and references

CVSS 3.1: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Severity from: the vendor (its own CVE record or advisory)
Weakness: CWE-416

More Microsoft advisories

Date	Advisory	Severity	Fixed in
Jul 14	Secret exfiltration vulnerability HighJul 14 CVE-2026-472821.128.1	High	1.128.1
Jul 14	Workspace Trust Security Feature Bypass Vulnerability HighJul 14 CVE-2026-571011.128.1	High	1.128.1
Jul 14	Remote Code Execution Vulnerability HighJul 14 CVE-2026-571021.128.1	High	1.128.1
Jul 14	Microsoft .NET 8.0: unsafe deserialization High7.8Jul 14 CVE-2026-506498.0.29+9 more	High7.8	8.0.29+9 more
Jul 14	Microsoft .NET 8.0: code injection High7.8Jul 14 CVE-2026-506508.0.29+10 more	High7.8	8.0.29+10 more
Jul 14	Microsoft .NET 10.0: resource exhaustion High7.5Jul 14 CVE-2026-5065110.0.10+5 more	High7.5	10.0.10+5 more

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