---
id: CVE-2025-55639
title: >-
  GPAC MP4Box v2.4 was discovered to contain a NULL pointer dereference in the
  gf_isom_add_track_kind() function at isomedia/isom_write.c
summary: >-
  GPAC MP4Box v2.4 was discovered to contain a NULL pointer dereference in the
  gf_isom_add_track_kind() function at isomedia/isom_write.c. This vulnerability
  allows attackers to cause a Denial of Service (DoS) via a crafted MP4 file.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: gpac
product: gpac
affected:
  - gpac < 26.02.0
patched:
  - gpac 26.02.0
published: '2026-06-23'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T16:10:00.443'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-55639'
references:
  - url: >-
      https://github.com/gpac/gpac/commit/027ce139dda498ee95df36db9f9f6f3cadce8ec9
    label: cve@mitre.org
  - url: 'https://github.com/gpac/gpac/issues/3260'
    label: cve@mitre.org
  - url: 'https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/23/23_poc.mp4'
    label: cve@mitre.org
  - url: 'https://infosec.exchange/@sigdevel/116769184815236865'
    label: cve@mitre.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/06/26/2'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/gpac/gpac/issues/3260'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00511
epssPercentile: 0.41522
ingestedAt: '2026-10-05T16:25:58.379Z'
---

## Overview

GPAC MP4Box v2.4 was discovered to contain a NULL pointer dereference in the gf_isom_add_track_kind() function at isomedia/isom_write.c. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted MP4 file.

## Affected

- `gpac < 26.02.0`

## Remediation

Upgrade past the affected range:

- `gpac 26.02.0`