Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-113749

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on an affected system.

The vulnerability exists due to a heap-based buffer overflow in Microsoft Windows Codecs Library when processing attacker-controlled input. A remote attacker can supply specially crafted input over a network to trigger memory corruption and execute arbitrary code, with exploitation requiring user interaction.

Affected software

How to mitigate CVE-2026-113749

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-113749
• https://support.microsoft.com/help/5131291

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Windows