CVE-2026-58542: Windows Media Remote Code Execution Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-14 · updated 2026-10-28
Weakness: CWE-122

Description

Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.

Affected products

Microsoft Windows 11: before 10.0.26100.8875 — fixed in 10.0.26100.8875
Microsoft Windows 11 25H2: before 10.0.26200.8875 — fixed in 10.0.26200.8875
Microsoft Windows 11 version 26H1: before 10.0.28000.2269 — fixed in 10.0.28000.2269
Microsoft Windows Server 2025: before 10.0.26100.33158 — fixed in 10.0.26100.33158
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.8875 — fixed in 10.0.26100.8875
Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.8875 — fixed in 10.0.26200.8875
Microsoft Windows 11 version 26H1: from 10.0.28000.0 before 10.0.28000.2525 — fixed in 10.0.28000.2525
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.33158 — fixed in 10.0.26100.33158

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.26100.8875; Microsoft Windows 11 25H2 10.0.26200.8875; Microsoft Windows 11 version 26H1 10.0.28000.2269; Microsoft Windows Server 2025 10.0.26100.33158; Microsoft Windows 11 10.0.26100.8875; Microsoft Windows 11 25H2 10.0.26200.8875; Microsoft Windows 11 version 26H1 10.0.28000.2525; Microsoft Windows Server 2025 10.0.26100.33158. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58542

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