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PatchSiren cyber security CVE debrief

CVE-2025-55664 GPAC CVE debrief

A heap buffer overflow vulnerability exists in the m2tsdmx_send_packet function within filters/dmx_m2ts.c in GPAC MP4Box v2.4. The flaw can be triggered when processing a crafted MP4 file, leading to a Denial of Service (DoS) condition. The vulnerability was addressed in a commit to the GPAC repository.

Vendor
GPAC
Product
MP4Box
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-01
Original CVE updated
2026-07-22
Advisory published
2026-06-01
Advisory updated
2026-07-22

Who should care

Organizations using GPAC MP4Box v2.4 for media file processing, particularly those handling untrusted MP4 inputs in automated workflows or user-facing applications. This includes media processing pipelines, content delivery networks, and multimedia analysis tools that rely on MP4Box for demuxing or inspection operations.

Technical summary

The vulnerability is a heap buffer overflow located in the m2tsdmx_send_packet function in filters/dmx_m2ts.c of GPAC MP4Box version 2.4. Attackers can exploit this by providing a maliciously crafted MP4 file, resulting in a Denial of Service. The issue has been fixed in the GPAC repository via commit 9bd6a72c9efc0513dfd33b87498afc7658dabd26.

Defensive priority

medium

Recommended defensive actions

  • Upgrade GPAC MP4Box to a version that includes the fix commit (9bd6a72c9efc0513dfd33b87498afc7658dabd26) or later.
  • Restrict processing of untrusted MP4 files from unknown or unverified sources.
  • Monitor for updates from the GPAC project regarding patched releases.
  • If upgrading is not immediately feasible, consider sandboxing or isolating MP4Box processing environments to limit impact from potential crashes.

Evidence notes

The CVE description identifies the affected function (m2tsdmx_send_packet) and file (filters/dmx_m2ts.c) in GPAC MP4Box v2.4. A commit reference is available that appears to contain a fix. An issue report is also referenced. The vendor field indicates low confidence with 'Unknown Vendor' and requires review; however, the source references clearly identify GPAC as the affected project.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-55664 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-55664

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

  • CVE-2025-55664 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-55664

    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.