CVE-2026-34340
Use after free in Windows Projected File System allows an authorized attacker to elevate privileges locally.
Published May 12, 2026 · corrected/updated Jun 17, 2026 · microsoft windows 10 1809 · evidence confidence medium
Use after free in Windows Projected File System allows an authorized attacker to elevate privileges locally.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-34340 is a high public vulnerability record for microsoft windows 10 1809. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether microsoft windows 10 1809 is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: microsoft/windows 10 1809; microsoft/windows 10 21h2; microsoft/windows 10 22h2. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 7.0. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-416. Sources contributing to this record: cve_org, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
May 12, 2026 · NIST NVD
Detected
Use after free in Windows Projected File System allows an authorized attacker to elevate privileges locally.
Jun 17, 2026 · NIST NVD
Updated
Use after free in Windows Projected File System allows an authorized attacker to elevate privileges locally.
Affected
- cpe microsoft/windows 10 1809version unspecified
- cpe microsoft/windows 10 21h2version unspecified
- cpe microsoft/windows 10 22h2version unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-34340
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-34340
Use after free in Windows Projected File System allows an authorized attacker to elevate privileges locally.
nvd.nist.gov