# CVE-2026-91086: GPAC heap-based buffer overflow in MPEG Video Reframer

Source: https://junglewise.ai/threats/cve-2026-91086-gpac-heap-based-buffer-overflow-in-mpeg-video-reframer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-91086 · Severity: medium · CVSS 6.3 · Published 2026-09-15

GPAC is a popular open-source multimedia framework used for video streaming, transcoding, and packaging. A heap-based buffer overflow vulnerability exists in its MPEG video reframing component, which could allow remote attackers to crash the application or potentially execute arbitrary code by sending a specially crafted video file.

## Quick answers

**Is CVE-2026-91086 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91086 being exploited in the wild.

**How severe is CVE-2026-91086?** Medium severity, with a CVSS score of 6.3, published 15 September 2026.

**Which products and versions are affected?** GPAC Project GPAC up to f1219cde.

**Is there a fix for CVE-2026-91086?** A patch was published on 2026-07-27: Patch commit afca1f1181668d85941d51ed1adf647807d5d975 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-91086 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-91086?** Check whether anything you run is named in the advisory. 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

The vulnerability is a heap-based buffer overflow in the mpgviddmx_process function of filters/reframe_mpgvid.c in the MPEG Video Reframer component. The attack is network-accessible and requires no authentication or user interaction beyond processing a malicious MPEG video file. An attacker can trigger memory corruption by providing a crafted MPEG video stream, potentially leading to denial of service or code execution. The issue has been patched in version abi-16.23 via commit afca1f1181668d85941d51ed1adf647807d5d975, and upgrading is recommended.

## Affected products

- GPAC Project GPAC up to f1219cde

## Timeline

- 2026-09-15: disclosed
- 2026-07-27: patched: Patch commit afca1f1181668d85941d51ed1adf647807d5d975

## References

- [https://github.com/gpac/gpac/](https://github.com/gpac/gpac/)
- [https://github.com/gpac/gpac/commit/afca1f1181668d85941d51ed1adf647807d5d975](https://github.com/gpac/gpac/commit/afca1f1181668d85941d51ed1adf647807d5d975)