# CVE-2026-58542: Microsoft Windows Media heap overflow code execution

Source: https://junglewise.ai/threats/cve-2026-58542-microsoft-windows-media-heap-overflow-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-58542 · Severity: high · CVSS 7.8 · Published 2026-07-14

A security vulnerability has been identified in Windows Media, a core component of the Windows operating system used for playing audio and video files. If a user is tricked into opening a specially crafted malicious media file, an attacker could gain the ability to run unauthorized code on the victim's computer. This could lead to a full system compromise, allowing the attacker to steal data, install malware, or disrupt operations.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows Server 2025](https://junglewise.ai/threats/technologies/windows-server-2025). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-58542 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58542 being exploited in the wild.

**How severe is CVE-2026-58542?** High severity, with a CVSS score of 7.8, published 14 July 2026.

**Which products and versions are affected?** Microsoft Windows 11 10.0.26100.0 to 10.0.26100.8875; Microsoft Windows Server 2025 10.0.26100.0 to 10.0.26100.33158.

**Is there a fix for CVE-2026-58542?** A patch was published on 2026-07-14: Security updates made available by Microsoft Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-58542 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-58542?** Check whether you run Microsoft Windows 11 or Microsoft Windows Server 2025 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow (CWE-122) exists in the Windows Media component across multiple versions of Windows 11 and Windows Server 2025. The vulnerability is triggered when the system processes a malformed media file. While the attack vector is local, it requires user interaction (UI:R), typically involving a user opening a malicious file provided by the attacker. Successful exploitation allows for arbitrary code execution with the privileges of the logged-in user. Microsoft has released security updates to address this issue; administrators should verify build versions against the MSRC update guide.

## Affected products

- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26100.8875
- Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2525
- Microsoft Windows Server 2025 10.0.26100.0 to 10.0.26100.33158

## Timeline

- 2026-07-14: advisory: Initial publication by Microsoft and NVD
- 2026-07-14: patched: Security updates made available by Microsoft

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58542](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58542)

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