Microsoft Qlib _mount_nfs_uri Command Injection Remote Code Execution Vulnerability

April 15th, 2026
ZDI-26-275 ZDI-CAN-27212

CVE ID

CVSS Score

8.8 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Microsoft

Affected Products

Qlib

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Microsoft Qlib. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the _mount_nfs_uri function. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root.

Additional Details

Fixed on May 31, 2025
https://msrc.microsoft.com/update-guide/acknowledgement/online


Disclosure Timeline

  • 2025-05-22 - Vulnerability reported to vendor
  • 2026-04-15 - Coordinated public release of advisory
  • 2026-04-15 - Advisory Updated

Credit

Peter Girnus (@gothburz) of Trend Zero Day Initiative

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