# CVE-2026-124030: GPAC type confusion in gf_sg_command_apply

Source: https://junglewise.ai/threats/cve-2026-124030-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-2026-124030 · Severity: medium · CVSS 5.5 · Published 2026-11-06

GPAC is a multimedia framework used for video streaming and MP4 file processing. A type confusion vulnerability in the BIFS command handler allows an attacker to crash MP4Box or applications using GPAC by supplying a crafted XMT file, potentially during chapter import operations. This could disrupt video processing workflows or be chained with other vulnerabilities for more severe impact.

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

## Quick answers

**Is CVE-2026-124030 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124030 being exploited in the wild.

**How severe is CVE-2026-124030?** 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-2026-124030?** 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-2026-124030 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-124030?** 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 gf_sg_command_apply() within src/scenegraph/commands.c that fails to validate BIFS field-replace command types match the target node fields. When a malicious XMT file is processed, the type mismatch causes gf_sg_vrml_field_clone() to perform memcpy operations from invalid memory pointers, resulting in a crash (denial of service).

## 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/scenegraph/commands.c](https://github.com/gpac/gpac/blob/v26.07.0/src/scenegraph/commands.c)

## Related threats

- [GPAC type confusion in drawable_get_aspect_2d_mpeg4 and TraverseShape](https://junglewise.ai/threats/cve-2026-124031-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)