# CVE-2025-55641: GPAC MP4Box NULL pointer dereference in gf_isom_copy_sample_info

Source: https://junglewise.ai/threats/cve-2025-55641-gpac-mp4box-null-pointer-dereference-in-gf-isom-copy-sample-info  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-15. Updated: 2026-06-15  
License: CC BY 4.0 with a link back

CVE-2025-55641 · Severity: info · Published 2026-06-15

GPAC MP4Box is a popular multimedia packager used to process and edit video files. A vulnerability in how it handles specific file data allows an attacker to crash the application by providing a specially crafted MP4 file. This results in a denial-of-service, potentially disrupting automated video processing workflows or media management systems.

Technologies: [Gpac MP4Box](https://junglewise.ai/threats/technologies/mp4box). Vendors: [Gpac](https://junglewise.ai/threats/vendors/gpac).

## Quick answers

**Is CVE-2025-55641 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-55641 being exploited in the wild.

**How severe is CVE-2025-55641?** Informational severity, published 15 June 2026.

**Which products and versions are affected?** Gpac MP4Box 2.4.

**Is there a fix for CVE-2025-55641?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-55641 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2025-55641?** Check whether you run Gpac MP4Box at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A NULL pointer dereference vulnerability exists in GPAC MP4Box v2.4 within the gf_isom_copy_sample_info function located in isomedia/isom_write.c. The flaw is triggered when the application attempts to access a memory address that is NULL during the processing of sample information from a malformed MP4 file. An attacker can exploit this by providing a specially crafted MP4 file to the utility, leading to an immediate application crash (Denial of Service). This is a local attack vector requiring the victim to process the malicious file. No authentication is required to trigger the crash beyond the ability to submit a file for processing.

## Affected products

- GPAC MP4Box 2.4

## Timeline

- 2026-06-15: disclosed: CVE published to NVD

## References

- [https://infosec.exchange/@sigdevel/116736775314270129](https://infosec.exchange/@sigdevel/116736775314270129)

## Related threats

- [GPAC MP4Box segmentation fault in dump_isom_saps](https://junglewise.ai/threats/cve-2025-55667-a-segmentation-violation-in-the-dump-isom-saps-function-mp4box)
- [GPAC MP4Box use-after-free in gf_filter_pid_get_packet](https://junglewise.ai/threats/cve-2025-55654-a-use-after-free-in-the-gf-filter-pid-get-packet-function-filter)
- [GPAC MP4Box floating point exception in gf_parse_lfrac](https://junglewise.ai/threats/cve-2025-55653-gpac-mp4box-v2-4-was-discovered-to-contain-a-floating-point)
- [GPAC MP4Box heap buffer overflow in stbl_AddSize](https://junglewise.ai/threats/cve-2025-55640-a-heap-buffer-overflow-in-the-stbl-addsize-function-isomedia-stbl)
- [GPAC MP4Box use-after-free in gf_node_deactivate_ex](https://junglewise.ai/threats/cve-2026-90827-gpac-mp4box-use-after-free-in-gf-node-deactivate-ex)