Quick answers
- Is CVE-2025-55643 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-55643 being exploited in the wild.
- How severe is CVE-2025-55643?
- Informational severity, with a CVSS score of 5.5, published 15 June 2026.
- Which products and versions are affected?
- Gpac MP4Box 2.4.
- Is there a fix for CVE-2025-55643?
- 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-2025-55643 attacked?
- It is attacked with local access, in a software library.
- Am I affected by CVE-2025-55643?
- Check whether you run Gpac MP4Box 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 TrackWriter handling component within filters/mux_isom.c of GPAC MP4Box v2.4. The vulnerability is triggered when the application attempts to process a maliciously crafted MP4 file that lacks expected data structures, leading to an invalid memory access. An attacker can exploit this by providing a specially designed file to be processed by the utility, resulting in an immediate crash (Denial of Service). This is a local attack vector requiring the user or an automated system to open the malicious file. No information regarding a formal patch was provided in the advisory.
Affected products
- GPAC MP4Box 2.4
Timeline
- 2026-06-15: disclosed: Initial disclosure of the vulnerability
- 2026-06-15: advisory: NVD record published