Quick answers
- Is CVE-2026-58599 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-58599 being exploited in the wild.
- How severe is CVE-2026-58599?
- High severity, with a CVSS score of 7.8, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Codecs Library.
- Is there a fix for CVE-2026-58599?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-58599 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-58599?
- Check whether you run Microsoft Windows Codecs Library. 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 exists in the Microsoft Windows Codecs Library, likely triggered during the processing of malformed image or codec data. The vulnerability requires local access to the system and does not require user interaction or authentication. Successful exploitation allows an attacker to execute arbitrary code in the context of the affected application or system process, potentially leading to privilege escalation. A patch is available from Microsoft via the Security Update Guide.
Affected products
- Microsoft Windows Codecs Library
Timeline
- 2026-09-08: disclosed