CVE-2026-34340 Details
Description
Use after free in Windows Projected File System allows an authorized attacker to elevate privileges locally.
A use-after-free vulnerability has been identified in the Windows Projected File System, allowing an authorized attacker to locally elevate privileges. This vulnerability arises from improper memory management, which can be exploited to gain higher system privileges.
Users can apply the security update for this vulnerability, which is available through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles KB5087544 for various Windows 10 versions, KB5087420 for Windows 11 versions, and KB5087538 for Windows Server 2019. For Windows Server 2022 and 2025, the relevant update information is also available through the Microsoft Update Catalog.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34340 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft windows 10 1809 | < 10.0.17763.8755 |
CPE
Remediation
| |
| microsoft windows 10 21h2 | < 10.0.19044.7291 |
CPE
Remediation
| |
| microsoft windows 10 22h2 | < 10.0.19045.7291 |
CPE
Remediation
| |
| microsoft windows 11 23h2 | < 10.0.22631.7079 |
CPE
Remediation
| |
| microsoft windows 11 24h2 | < 10.0.26100.8390 |
CPE
Remediation
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| microsoft windows 11 25h2 | < 10.0.26200.8390 |
CPE
Remediation
| |
| microsoft windows 11 26h1 | < 10.0.28000.2113 |
CPE
Remediation
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| microsoft windows server 2019 | < 10.0.17763.8755 |
CPE
Remediation
| |
| microsoft windows server 2022 | < 10.0.20348.5074 |
CPE
Remediation
| |
| microsoft windows server 2022 23h2 | < 10.0.25398.2330 |
CPE
Remediation
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| microsoft windows server 2025 | < 10.0.26100.32772 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 14, 2026 | Initial Analysis | [email protected] |
| May 12, 2026 | New CVE Received | [email protected] |