# CVE-2026-90685: GPAC MP4Box reachable assertion in LSR command processing

Source: https://junglewise.ai/threats/cve-2026-90685-gpac-mp4box-reachable-assertion-in-lsr-command-processing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-90685 · Severity: low · CVSS 2.8 · Published 2026-09-14

GPAC is an open-source multimedia framework used for video streaming, transcoding, and packaging. MP4Box is a command-line tool within GPAC for manipulating MP4 files. A reachable assertion vulnerability in the LSR command parser can cause MP4Box to crash when processing malformed LSR-encoded media files, leading to denial of service of the tool's functionality.

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

## Quick answers

**Is CVE-2026-90685 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90685 being exploited in the wild.

**How severe is CVE-2026-90685?** Low severity, with a CVSS score of 2.8, published 14 September 2026.

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

**Is there a fix for CVE-2026-90685?** A patch was published on 2026-07-27: Patch commit afca1f1181668d85941d51ed1adf647807d5d975 authored; version abi-16.23 or later contains fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-90685 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-90685?** 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 reachable assertion exists in the lsr_exec_command_list function within laser/lsr_dec.c of GPAC's MP4Box component. The vulnerability is triggered during the parsing of LSR (Lightweight Scene Representation) command data and allows a local attacker with access to craft malicious LSR-encoded files to trigger the assertion, causing abnormal termination. Local file access is required; the vulnerability cannot be exploited remotely. The issue was addressed in commit afca1f1181668d85941d51ed1adf647807d5d975 and patch is available in version abi-16.23 or later.

## Affected products

- GPAC GPAC up to f1219cde

## Timeline

- 2026-09-14: disclosed
- 2026-07-27: patched: Patch commit afca1f1181668d85941d51ed1adf647807d5d975 authored; version abi-16.23 or later contains fix

## 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)

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- [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)