# CVE-2025-55653: GPAC MP4Box floating point exception in gf_parse_lfrac

Source: https://junglewise.ai/threats/cve-2025-55653-gpac-mp4box-v2-4-was-discovered-to-contain-a-floating-point  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-16. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2025-55653 · Severity: info · Published 2026-10-16

GPAC MP4Box is a multimedia file processing tool that handles MP4 video files. A crafted MP4 file with invalid fraction data can crash the application with a floating-point exception, causing an unplanned service interruption when processing untrusted media files.

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

## Quick answers

**Is CVE-2025-55653 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-55653 being exploited in the wild.

**How severe is CVE-2025-55653?** Informational severity, published 16 October 2026.

**Which products and versions are affected?** Gpac MP4Box v2.4 and earlier.

**Is there a fix for CVE-2025-55653?** Yes: fixed in GPAC commit 4bbb6e5 (post-v2.4). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-55653 attacked?** It is attacked over the network or with local access, in a software library.

**Am I affected by CVE-2025-55653?** 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.

## How to fix

- Fixed in GPAC commit 4bbb6e5 (post-v2.4)

## Technical details

The gf_parse_lfrac function in utils/error.c performs division on a denominator without validating it is non-zero, leading to a SIGFPE when processing MP4 files containing zero-denominator fraction strings. This is a denial-of-service vulnerability triggered by providing a malicious MP4 file to MP4Box, requiring no authentication or user interaction beyond opening the file.

## Affected products

- GPAC MP4Box v2.4 and earlier

## Timeline

- 2025-05-31: disclosed: Issue reported on GitHub
- 2025-06-10: patched: Fix committed as 4bbb6e5

## References

- [https://github.com/gpac/gpac/commit/4bbb6e5](https://github.com/gpac/gpac/commit/4bbb6e5)
- [https://github.com/gpac/gpac/issues/3247](https://github.com/gpac/gpac/issues/3247)

## 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 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)
- [GPAC MP4Box out-of-bounds read in gf_node_del](https://junglewise.ai/threats/cve-2026-90826-gpac-mp4box-out-of-bounds-read-in-gf-node-del)