CVE-2026-54992 is a Microsoft Message Queuing Queue Manager heap-based buffer overflow that can lead to remote code execution. Microsoft rates it CVSS v3.1 base 8.4 (High) with a temporal score of 7.3. The attack vector is local (AV:L), with low attack complexity, no privileges required, no user interaction, and high confidentiality, integrity, and availability impact. Microsoft lists exploitation as not observed and not publicly disclosed, but marks exploitation as more likely. Because the vector is local rather than network-based, it is generally lower risk for internet-exposed services than remote network RCE issues, but it remains significant for systems where local code execution is possible.

Highlights:
- CVSS scores: Base 8.4 - Temporal 7.3
- Exploit status & code maturity: Publicly Disclosed: No; Exploited: No; Exploit Code Maturity: UNPROVEN.
- Impact: Remote Code Execution with HIGH confidentiality, integrity, and availability impacts.
- Exploitation likelihood: Exploitation More Likely; local attack vector, LOW attack complexity, NO privileges required, and NO user interaction.
- Severity for enterprise: High severity overall, but the local-only vector reduces exposure compared with network RCE. Risk is most relevant on endpoints or servers where an attacker can obtain local execution.
- Patch status: available; customer action required.

Affected systems:
- Windows 10 1607
- Windows 10 1809
- Windows 10 21H2
- Windows 10 22H2
- Windows 11 24H2
- Windows 11 25H2
- Windows 11 26H1
- Windows 11 unspecified
- Windows Server 2012
- Windows Server 2012 R2
- Windows Server 2016
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025