# CVE-2020-11558: Use after free in n/a

> A use-after-free vulnerability in GPAC's MP4Box allows attackers to execute arbitrary code or cause denial of service via crafted media files.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Apr 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-11558, GHSA-vh3c-9xjh-4qgg, UBUNTU-CVE-2020-11558

## What is CVE-2020-11558?

CVE-2020-11558 is a critical use after free vulnerability in Gpac Gpac, published on 5 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in libgpac.a in GPAC 0.8.0, as demonstrated by MP4Box. audio_sample_entry_Read in isomedia/box_code_base.c does not properly decide when to make gf_isom_box_del calls. This leads to various use-after-free outcomes involving mdia_Read, gf_isom_delete_movie, and gf_isom_parse_movie_boxes.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2020-11558?

It affects 1 product.


Products: Gpac Gpac.

## How do I fix CVE-2020-11558?

Upgrade to a fixed version.

## Is CVE-2020-11558 being exploited?

There is no known exploitation of CVE-2020-11558 in the wild and no public exploit code.

## 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-2020-19751](https://insights.sbomify.com/CVE-2020-19751/): Memory corruption in n/a (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-11558 and fix it if it is affected.

What it is: CVE-2020-11558 is a critical use after free vulnerability in Gpac Gpac, published on 5 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-11558 in the wild and no public exploit code.

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-2020-11558/ (Markdown: https://insights.sbomify.com/CVE-2020-11558/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-11558
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-11558
- OSV: https://osv.dev/vulnerability/CVE-2020-11558

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-11558/
Summaries are generated and may contain mistakes; the official description above is the record.