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5.5

Out-of-bounds write vulnerability in Microsoft Windows File System

CVE-2026-34863 · published 6 months ago
Summary

A vulnerability in Microsoft Windows File System can allow unauthorized access to sensitive files, potentially leading to data loss or system crashes. This is a concern for business owners as it can impact the availability of critical files and systems. To mitigate this risk, ensure all Windows systems are kept up to date with the latest security patches.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
huawei harmonyos 5.1.0
6.0.0
cpe:2.3:o:huawei:harmonyos:5.1.0:*:*:*:*:*:*:*
Original advisory text
Out-of-bounds write vulnerability in the file system. Impact: Successful exploitation of this vulnerability may affect availability.
Out-of-bounds write vulnerability in the file system.
Impact: Successful exploitation of this vulnerability may affect availability.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
5.5 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-787Out-of-bounds Write
Timeline
Published13 Apr 2026
Updated26 Oct 2026
First seen13 Apr 2026
Sources
CVE-2026-34863 · NVD
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