Quick answers
- Is CVE-2026-36909 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-36909 being exploited in the wild.
- How severe is CVE-2026-36909?
- Informational severity, with a CVSS score of 5.5, published 1 July 2026.
- Which products and versions are affected?
- Aleksoid1978 MPC-BE before commit 4341cb3.
- Is there a fix for CVE-2026-36909?
- 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-2026-36909 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2026-36909?
- Check whether you run Aleksoid1978 MPC-BE 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 NULL pointer dereference exists in the AP4_TkhdAtom::GetTrackId() function within the Bento4 library component used by Aleksoid1978 MPC-BE. The vulnerability is triggered when the application attempts to parse a malformed MP4 file containing specific atom structures. An attacker can exploit this by providing a crafted file to a user, which, when opened, causes the media player to crash (Denial of Service). The issue was addressed in commit 4341cb3.
Affected products
- Aleksoid1978 MPC-BE before commit 4341cb3
Timeline
- 2026-07-01: advisory: NVD publication date
- 2026-07-01: disclosed