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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
2026-06-16
Advisory published
2026-06-15
Advisory updated
2026-06-16

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].

Sources and references

Verified primary and authoritative sources

  • CVE-2025-55643 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-55643

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-55643 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-55643

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.