Local code execution via heap buffer overflow
Published Sep 8, 2026 · Updated Sep 10, 2026
Heap-based buffer overflow in Microsoft HEVC Video Extensions allows attackers to execute code locally through HEVC media processing. The Windows Codecs Library writes past a heap allocation, but Microsoft has not disclosed the affected routine, triggering field, or faulty length operation. Exploitation requires no privileges but does require local reachability and user interaction, and successful exploitation runs attacker-controlled code.
Summary
What happened
Heap-based buffer overflow in Microsoft HEVC Video Extensions allows attackers to execute code locally through HEVC media processing. The Windows Codecs Library writes past a heap allocation, but Microsoft has not disclosed the affected routine, triggering field, or faulty length operation. Exploitation requires no privileges but does require local reachability and user interaction, and successful exploitation runs attacker-controlled code.
The record
- CVE
- CVE-2026-58599
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- HEVC Video Extensions for Licensed Applications
- Classifications
- CWE-122, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 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=2.0.0.0 <2.4.85.0
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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