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BleepingComputer and MSRC confirm the CVE-2026-62744 heap-based buffer overflow RCE in Windows Media Foundation (CVSS 8.8), part of September 2026 updates.

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Home/Tech/Microsoft Windows Media Foundation CVE-2026-62744 Rated High Severity
VERIFIEDBy Xavier Rivera·Tuesday, September 8, 2026 at 3:36 PM EDT·1 min read

Microsoft Windows Media Foundation CVE-2026-62744 Rated High Severity

Microsoft has published details on CVE-2026-62744, a heap-based buffer overflow in Windows Media Foundation that allows unauthorized remote code execution with a CVSS score of 8.8. The flaw requires a user to open a specially crafted media file and is included in the September 2026 security updates.

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Microsoft Windows Media Foundation CVE-2026-62744 Rated High Severity
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TL;DRAI · 60 sec read

Microsoft publishes details on CVE-2026-62744, a high-severity vulnerability in Windows Media Foundation. A heap-based buffer overflow enables remote code execution over a network when users open specially crafted media files. The flaw has a CVSS score of 8.8, is part of September 2026 updates, and shows no active exploitation.

Microsoft has published details on a high-severity vulnerability in Windows Media Foundation that could allow remote code execution.

Heap-based buffer overflow enables network-based code execution. The flaw, tracked as CVE-2026-62744, is a heap-based buffer overflow in Microsoft Windows Media Foundation. It allows an unauthorized attacker to execute code over a network.
It allows an unauthorized attacker to execute code over a network.

The CVSS 3.1 score is 8.8 with vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Exploitation requires convincing a user to open a specially crafted media file.
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Advisory confirms no active exploitation. No public disclosure or active exploitation is noted at the time of release. The advisory includes product-specific KB articles, severity ratings, and restart requirements for affected Windows versions.
No public disclosure or active exploitation is noted at the time of release.
It forms part of the broader September 2026 security updates. Microsoft provides an FAQ on privileges gained, which amount to arbitrary code execution.
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Vulnerability classified under CWE-122. Microsoft confirms the weakness as CWE-122, or Heap-based Buffer Overflow. The advisory is available from the Microsoft Security Response Center.

EXPERT TAKE

Enterprises should prioritize the September 2026 patch bundle and monitor for user-targeted lures involving media files, as the high confidentiality and integrity impact could enable broad system compromise.

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