# CVE-2018-18829: Null dereference in n/a

> Attackers can cause a denial of service in Libav by providing a crafted AAC file that triggers a NULL pointer dereference.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 Oct 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-3pfq-8m56-48p7, UBUNTU-CVE-2018-18829

## What is CVE-2018-18829?

CVE-2018-18829 is a medium-severity vulnerability in Libav Libav, published on 30 Oct 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

There exists a NULL pointer dereference in ff_vc1_parse_frame_header_adv in vc1.c in Libav 12.3, which allows attackers to cause a denial-of-service through a crafted aac file.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2018-18829?

It affects 1 product.


Products: Libav Libav.

## How do I fix CVE-2018-18829?

No fix has been published for CVE-2018-18829 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-18829 being exploited?

There is no known exploitation of CVE-2018-18829 in the wild and no public exploit code.

## Other vulnerabilities in Libav Libav

- [CVE-2014-3984](https://insights.sbomify.com/CVE-2014-3984/): Multiple unspecified vulnerabilities in Libav before 0.8.12 allow remote attackers to have unknown impact and vectors. (critical 10.0)
- [CVE-2017-9051](https://insights.sbomify.com/CVE-2017-9051/): Null dereference in n/a (critical 9.8)
- [CVE-2014-4609](https://insights.sbomify.com/CVE-2014-4609/): Integer overflow in n/a (high 8.8)
- [CVE-2019-9719](https://insights.sbomify.com/CVE-2019-9719/): Memory corruption in n/a (high 8.8)
- [CVE-2018-5766](https://insights.sbomify.com/CVE-2018-5766/): Memory corruption in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-18829 and fix it if it is affected.

What it is: CVE-2018-18829 is a medium-severity vulnerability in Libav Libav, published on 30 Oct 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-18829 in the wild and no public exploit code.

Affected product: Libav Libav. 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-2018-18829/ (Markdown: https://insights.sbomify.com/CVE-2018-18829/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18829
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18829
- OSV: https://osv.dev/vulnerability/CVE-2018-18829

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18829/
Summaries are generated and may contain mistakes; the official description above is the record.