Out-of-bounds write in Microsoft products - CVE-2026-62871

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code locally.

The vulnerability exists due to out-of-bounds write in .NET when a user triggers the payload in the application. A remote attacker can craft a payload to execute arbitrary code locally.

Successful exploitation could result in SYSTEM privileges. User interaction is required.

Affected software

How to mitigate CVE-2026-62871

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-62871
• https://support.microsoft.com/help/5122106

Related Security Bulletins

• Multiple vulnerabilities in Microsoft .NET Framework