# CVE-2026-8124: GPAC box_code_base.c sidx_box_read allocation of resources

> A local attacker can cause resource exhaustion in GPAC via the sidx_box_read function, leading to denial of service.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 8 May 2026
- **Updated:** 8 May 2026
- **Also known as:** DEBIAN-CVE-2026-8124, GHSA-qvg3-xf4r-fgqm, UBUNTU-CVE-2026-8124

## What is CVE-2026-8124?

CVE-2026-8124 is a medium-severity denial of service vulnerability in Gpac Gpac, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A security vulnerability has been detected in GPAC up to 26.02.0. This affects the function sidx_box_read of the file src/isomedia/box_code_base.c. The manipulation leads to allocation of resources. The attack must be carried out locally. The exploit has been disclosed publicly and may be used. The identifier of the patch is 442e2299530138d8f874fd885c565ba98a6318ba. It is suggested to install a patch to address this issue.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-8124?

It affects 1 product.


Products: Gpac Gpac.

## How do I fix CVE-2026-8124?

No fix has been published for CVE-2026-8124 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8124 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8124 exists.

## Other vulnerabilities in Gpac Gpac

- [CVE-2023-46427](https://insights.sbomify.com/CVE-2023-46427/): Null dereference in n/a (critical 9.8)
- [CVE-2023-46932](https://insights.sbomify.com/CVE-2023-46932/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-36190](https://insights.sbomify.com/CVE-2022-36190/): Use after free in n/a (critical 9.8)
- [CVE-2021-28300](https://insights.sbomify.com/CVE-2021-28300/): Null dereference in n/a (critical 9.8)
- [CVE-2020-11558](https://insights.sbomify.com/CVE-2020-11558/): Use after free in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8124 and fix it if it is affected.

What it is: CVE-2026-8124 is a medium-severity denial of service vulnerability in Gpac Gpac, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8124 exists.

Affected product: Gpac 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-2026-8124/ (Markdown: https://insights.sbomify.com/CVE-2026-8124/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8124
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8124
- OSV: https://osv.dev/vulnerability/CVE-2026-8124

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-8124/
Summaries are generated and may contain mistakes; the official description above is the record.