# CVE-2022-27406: Null dereference in n/a

> A segmentation violation in FreeType's FT_Request_Size function allows attackers to cause a denial of service via crafted font files.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** Yes
- **Published:** 22 Apr 2022
- **Updated:** 9 Jul 2026
- **Also known as:** ALPINE-CVE-2022-27406, AZL-26759, AZL-9581, DEBIAN-CVE-2022-27406, GHSA-34wh-7j35-vw3w, JLSEC-2026-459, UBUNTU-CVE-2022-27406, USN-5453-1

## What is CVE-2022-27406?

CVE-2022-27406 is a high-severity vulnerability in Fedoraproject Fedora, published on 22 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

FreeType commit 22a0cccb4d9d002f33c1ba7a4b36812c7d4f46b5 was discovered to contain a segmentation violation via the function FT_Request_Size.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2022-27406?

It affects 2 products.


Products: Fedoraproject Fedora, Freetype Freetype.

## How do I fix CVE-2022-27406?

Apply the vendor's patch.

## Is CVE-2022-27406 being exploited?

There is no known exploitation of CVE-2022-27406 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-27406 and fix it if it is affected.

What it is: CVE-2022-27406 is a high-severity vulnerability in Fedoraproject Fedora, published on 22 Apr 2022. 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-2022-27406 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2022-27406/ (Markdown: https://insights.sbomify.com/CVE-2022-27406/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-27406
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-27406
- OSV: https://osv.dev/vulnerability/CVE-2022-27406

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-27406/
Summaries are generated and may contain mistakes; the official description above is the record.