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PatchSiren cyber security CVE debrief

CVE-2025-55643 GPAC CVE debrief

CVE-2025-55643 is a medium-severity vulnerability in GPAC MP4Box v2.4. A NULL pointer dereference in the TrackWriter handling component (filters/mux_isom.c) allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file. The vulnerability has a CVSS score of 5.5 and was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2025-55643).

Vendor
GPAC
Product
MP4Box
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-06-15
Advisory published
2026-06-15
Advisory updated
2026-06-15

Who should care

Users of GPAC MP4Box v2.4 should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by a NULL pointer dereference in the TrackWriter handling component (filters/mux_isom.c) of GPAC MP4Box v2.4. This can be exploited by supplying a crafted MP4 file, leading to a Denial of Service (DoS).

Defensive priority

medium

Recommended defensive actions

  • Update to a patched version of GPAC MP4Box if available.
  • Be cautious when handling MP4 files from untrusted sources.

Evidence notes

The CVE record was obtained from the official CVE website [cve-org]. Additional information was obtained from the NVD [nvd].

Official resources

CVE-2025-55643 was published on 2026-06-15T20:16:23.380Z and modified on 2026-06-15T21:16:32.847Z.