# CVE-2026-108539: GPAC use after free in MP4Box filter queue

Source: https://junglewise.ai/threats/cve-2026-108539-a-vulnerability-was-detected-in-gpac-up-to-26-07-0-this-affects  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-11. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-108539 · Severity: medium · CVSS 6.3 · Published 2026-10-11

GPAC is a multimedia framework used for processing and streaming audio and video content. A use-after-free vulnerability in the MP4Box component allows remote attackers to crash the application or potentially execute arbitrary code during media file processing. Public exploit code is available.

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

## Quick answers

**Is CVE-2026-108539 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-108539 being exploited in the wild.

**How severe is CVE-2026-108539?** Medium severity, with a CVSS score of 6.3, published 11 October 2026.

**Which products and versions are affected?** Gpac up to 26.07.0.

**Is there a fix for CVE-2026-108539?** 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-2026-108539 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-108539?** Check whether you run Gpac 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 use-after-free vulnerability exists in the gf_fq_pop function of filter_core/filter_queue.c in GPAC's MP4Box component. The vulnerability can be triggered remotely during manipulation of media files, allowing an attacker to read or write memory after it has been freed. A public proof-of-concept exploit is available.

## Affected products

- GPAC GPAC up to 26.07.0

## Timeline

- 2026-10-11: disclosed

## References

- [https://github.com/user-attachments/files/31288202/PoC.zip](https://github.com/user-attachments/files/31288202/PoC.zip)
- [https://vuldb.com/cve/CVE-2026-108539](https://vuldb.com/cve/CVE-2026-108539)

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