Local code execution via heap buffer overflow
Published Jul 14, 2026 · Updated Jul 14, 2026
Heap-based buffer overflow in Windows Media on affected Windows 11 and Server 2025 releases allows attackers to execute code locally. Microsoft has not disclosed the affected Windows Media parser, the malformed input involved, or the operation that overruns the heap buffer. Exploitation requires user interaction on the local system, and successful code execution operates within the affected user's security context.
Summary
What happened
Heap-based buffer overflow in Windows Media on affected Windows 11 and Server 2025 releases allows attackers to execute code locally. Microsoft has not disclosed the affected Windows Media parser, the malformed input involved, or the operation that overruns the heap buffer. Exploitation requires user interaction on the local system, and successful code execution operates within the affected user's security context.
The record
- CVE
- CVE-2026-58542
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-122, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.26100.0 <10.0.26100.33158
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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