Executive brief
Aleksoid1978 MPC-BE, a popular open-source media player for Windows, is vulnerable to a crash when processing specifically malformed video files. An attacker could share a specially crafted MP4 file that, when opened by a user, causes the application to stop responding or crash entirely. This disrupts the user's ability to use the software but does not typically lead to data theft.
Technical details
A NULL pointer dereference exists in the AP4_AtomSampleTable::GetSample() function within the Bento4 library integration of Aleksoid1978 MPC-BE. The vulnerability is triggered when the application attempts to process a malformed MP4 file containing inconsistent sample table atoms, specifically within the AP4_Stz2Atom::GetSampleSize logic. An attacker can exploit this by providing a crafted MP4 file that leads to a memory access violation (SEGV) on the zero page. This results in a local denial-of-service (application crash). The issue was addressed in commit 4341cb3.
Affected products
- Aleksoid1978 MPC-BE before commit 4341cb3
Timeline
- 2020-05-16: disclosed: Initial discovery in underlying Bento4 library reported
- 2026-07-01: advisory: CVE published by NVD/MITRE