Out-of-bounds write in Microsoft Windows and Windows Server - CVE-2026-116928

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code with the permissions of the affected processing service.

The vulnerability exists due to an out-of-bounds write in the Microsoft Windows Search component when processing email attachments for indexing in Microsoft Exchange Server. A remote attacker can send an email containing a specially crafted attachment that Exchange automatically processes for indexing to execute arbitrary code.

Affected software

How to mitigate CVE-2026-116928

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-116928
• https://support.microsoft.com/help/5132061

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Windows