# CVE-2026-124031: GPAC type confusion in drawable_get_aspect_2d_mpeg4 and TraverseShape

Source: https://junglewise.ai/threats/cve-2026-124031-gpac-through-26-07-0-contains-a-type-confusion-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-124031 · Severity: medium · CVSS 5.5 · Published 2026-11-06

GPAC is a multimedia framework that processes video, audio, and graphical content. A type confusion vulnerability in GPAC through version 26.07.0 allows attackers to supply a specially crafted XMT file that crashes the MP4Box tool, causing a denial of service. While the immediate impact is a crash, this memory safety issue could potentially be exploited for further damage depending on attacker control over the corrupted memory access.

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

## Quick answers

**Is CVE-2026-124031 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124031 being exploited in the wild.

**How severe is CVE-2026-124031?** Medium severity, with a CVSS score of 5.5, published 6 November 2026.

**Which products and versions are affected?** Gpac through 26.07.0.

**Is there a fix for CVE-2026-124031?** 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-2026-124031 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-124031?** 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

The vulnerability is a type confusion flaw in the drawable_get_aspect_2d_mpeg4() and TraverseShape() functions where a Shape's appearance node is unsafely cast to M_Appearance without validating the node's type tag. An attacker can craft an XMT file that places an incompatible node type (such as Conditional) in the appearance field, triggering an invalid memory read. The attack requires providing a malicious XMT file to MP4Box but no authentication or special network conditions.

## Affected products

- GPAC GPAC through 26.07.0

## Timeline

- 2026-11-06: disclosed

## References

- [https://github.com/gpac/gpac](https://github.com/gpac/gpac)
- [https://github.com/gpac/gpac/blob/v26.07.0/src/compositor/drawable.c](https://github.com/gpac/gpac/blob/v26.07.0/src/compositor/drawable.c)

## Related threats

- [GPAC type confusion in gf_sg_command_apply](https://junglewise.ai/threats/cve-2026-124030-gpac-through-26-07-0-contains-a-type-confusion-vulnerability-in)
- [GPAC out-of-bounds write in AIT parser](https://junglewise.ai/threats/cve-2026-109827-a-vulnerability-has-been-found-in-gpac-up-to-26-07-0-this)
- [GPAC use after free in MP4Box filter queue](https://junglewise.ai/threats/cve-2026-108539-a-vulnerability-was-detected-in-gpac-up-to-26-07-0-this-affects)
- [GPAC buffer overflow in DASH Client URL resolution](https://junglewise.ai/threats/cve-2026-103227-a-weakness-has-been-identified-in-gpac-up-to-26-07-0-affected-by)
- [GPAC out-of-bounds read in RTP depacketizer](https://junglewise.ai/threats/cve-2026-93331-gpac-out-of-bounds-read-in-rtp-depacketizer)