# CVE-2026-90685: GPAC MP4Box lsr_dec.c lsr_exec_command_list assertion

> A reachable assertion in GPAC MP4Box allows local attackers to cause a denial of service via crafted media files.

- **Severity:** Low 2.4 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Sep 2026
- **Updated:** 16 Sep 2026
- **Also known as:** GHSA-wx52-cwmq-x76w, UBUNTU-CVE-2026-90685

## What is CVE-2026-90685?

CVE-2026-90685 is a low-severity denial of service vulnerability in GPAC, published on 14 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A vulnerability has been found in GPAC up to f1219cde. Affected by this issue is the function lsr_exec_command_list of the file laser/lsr_dec.c of the component MP4Box. The manipulation leads to reachable assertion. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. Upgrading to version abi-16.23 can resolve this issue. The identifier of the patch is afca1f1181668d85941d51ed1adf647807d5d975. The affected component should be upgraded.

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2026-90685?


## How do I fix CVE-2026-90685?

No fix has been published for CVE-2026-90685 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-90685 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90685 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90685 and fix it if it is affected.

What it is: CVE-2026-90685 is a low-severity denial of service vulnerability in GPAC, published on 14 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90685 exists.

Affected product: GPAC. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-90685/ (Markdown: https://insights.sbomify.com/CVE-2026-90685/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90685
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90685
- OSV: https://osv.dev/vulnerability/CVE-2026-90685

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90685/
Summaries are generated and may contain mistakes; the official description above is the record.