CVE-2025-55643 GPAC CVE debrief

Who should care

Defenders responsible for GPAC MP4Box deployments should assess exposure and prioritize remediation due to the potential for DoS. Defenders should verify vulnerability status and apply patches if available. The vulnerability has a medium severity and defenders should assess exposure and prioritize remediation due to the potential for DoS. Defenders should review compensating controls for exposed systems while and a

Why it matters

CVE-2025-55643 is a medium-severity vulnerability in GPAC MP4Box v2.4 that allows for Denial of Service (DoS) via a crafted MP4 file. Defenders responsible for GPAC MP4Box deployments should assess exposure, prioritize remediation, and verify vulnerability status.

• Potential for Denial of Service (DoS) via crafted MP4 files
• Need for vulnerability verification and patch application

Technical summary

A NULL pointer dereference vulnerability exists in the TrackWriter handling component (filters/mux_isom.c) of GPAC MP4Box v2.4. This vulnerability allows attackers to cause a Denial of Service (DoS) by supplying a crafted MP4 file. The vulnerability has a medium severity and defenders should assess exposure and prioritize remediation due to the potential for DoS. The vulnerability was discovered in GPAC MP4Box v2.4 and defenders should verify vulnerability status and apply patches if available.

Defensive priority

Medium priority for remediation due to potential for DoS

Recommended defensive actions

• Assess exposure of GPAC MP4Box v2.4 in your environment
• Prioritize remediation of vulnerable GPAC MP4Box instances
• Verify vulnerability status and apply patches if available

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and exploitation is limited. The vulnerability was discovered in GPAC MP4Box v2.4 and allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file. Defenders should verify vulnerability status and apply patches if available. The CVE record was published on 2026-06-15T20:16:23.380Z and has not been modified since then.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.