# CVE-2025-60475: GPAC MP4Box buffer overflow in AC4 parser

Source: https://junglewise.ai/threats/cve-2025-60475-a-buffer-overflow-in-the-gf-ac4-parser-bs-function-media-tools-av  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2025-60475 · Severity: info · Published 2026-10-20

MP4Box is a multimedia file processing tool used to manipulate MP4 video containers. A buffer overflow in its AC4 audio stream parser allows an attacker to crash the application by supplying a specially crafted media file, resulting in a denial of service.

Technologies: [GPAC Project MP4Box](https://junglewise.ai/threats/technologies/gpac-project-mp4box). Vendors: [GPAC Project](https://junglewise.ai/threats/vendors/gpac-project).

## Quick answers

**Is CVE-2025-60475 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-60475 being exploited in the wild.

**How severe is CVE-2025-60475?** Informational severity, published 20 October 2026.

**Which products and versions are affected?** GPAC Project MP4Box before 2.5.

**Is there a fix for CVE-2025-60475?** Yes: fixed in 2.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-60475 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-60475?** Check whether you run GPAC Project 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 2.5

## Technical details

The vulnerability is a global buffer overflow in the gf_ac4_parser_bs function (media_tools/av_parsers.c:16140) where the parser accesses AC4_SAMPLE_DELTA_TABLE_48 without proper bounds checking on an attacker-controlled index value. This causes a 4-byte read beyond the global array's boundary when processing a crafted AC4 audio stream. The vulnerability requires a malicious file input but no authentication or user interaction beyond opening the file.

## Affected products

- GPAC Project MP4Box before 2.5

## Timeline

- 2025-07-14: disclosed
- 2025-07-15: patched

## References

- [https://github.com/gpac/gpac/commit/e02d1fd24cdc26acb1b236ab38b3832cffcae21b](https://github.com/gpac/gpac/commit/e02d1fd24cdc26acb1b236ab38b3832cffcae21b)
- [https://github.com/gpac/gpac/issues/3291](https://github.com/gpac/gpac/issues/3291)

## Related threats

- [GPAC MP4Box heap use-after-free in AC4 descriptor parsing](https://junglewise.ai/threats/cve-2025-60476-a-heap-use-after-free-in-the-gf-odf-ac4-cfg-clean-list-function)
- [GPAC MP4Box NULL pointer dereference in AC4 parser](https://junglewise.ai/threats/cve-2025-60469-a-null-pointer-dereference-in-the-gf-ac4-presentation-ch-mode)
- [GPAC MP4Box null pointer dereference in GetESD](https://junglewise.ai/threats/cve-2025-60497-a-segmentation-violation-in-the-getesd-function-isomedia-track-c)
- [GPAC MP4Box segmentation violation in check_media_profile](https://junglewise.ai/threats/cve-2025-60493-a-segmentation-violation-in-the-check-media-profile-function)
- [GPAC MP4Box stack overflow in BIFS scene decoder](https://junglewise.ai/threats/cve-2025-60492-a-stack-overflow-in-the-gf-bifs-dec-node-function-bifs-field)