CVE-2026-58599: CWE-122: Heap-based Buffer Overflow in Microsoft HEVC Video Extensions
Description
CVE-2026-58599 is a heap-based buffer overflow vulnerability in the Microsoft HEVC Video Extensions codec library. This flaw allows an unauthorized attacker to execute code locally on affected systems. The vulnerability has a high severity rating with a CVSS score of 7.8. Microsoft has released an official fix to address this issue.
CVSS v3.1
Score 7.8high
Affected software
Microsoft
HEVC Video Extensions
Microsoft
HEVC Video Extensions for Licensed Applications
Microsoft
HEVC Video Extensions from Device Manufacturer
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-58599) involves a heap-based buffer overflow in the Microsoft Windows Codecs Library component used by the HEVC Video Extensions. Exploitation could enable an attacker to execute arbitrary code locally. The vulnerability affects multiple versions of the HEVC Video Extensions, specifically versions >=1.0.0 and <2.4.87.0, >=2.0.0.0 and <2.4.85.0, and >=2.0.0.0 and <2.4.86.0. The issue has been officially fixed by Microsoft as indicated in their security advisory.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code with local privileges, potentially leading to full system compromise. The CVSS score of 7.8 reflects high impact on confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58599 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-01T18:03:43.124Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58599","vendor":"Microsoft"}]
Threat ID: 6aa044c4acd9273b49fa5fc3
Added to database: 09/08/2026, 17:24:20 UTC
Last enriched: 10/16/2026, 20:48:27 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 29
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