# CVE-2022-39346: Missing length validation of user displayname in nextcloud server

> A malicious user can overload the database by submitting excessively long display names, causing a denial of service in Nextcloud server.

- **Severity:** Low 3.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 25 Nov 2022
- **Updated:** 23 Apr 2025
- **Also known as:** GHSA-6w9f-jgjx-4vj6

## What is CVE-2022-39346?

CVE-2022-39346 is a low-severity denial of service vulnerability in Fedoraproject Fedora, published on 25 Nov 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Nextcloud server is an open source personal cloud server. Affected versions of nextcloud server did not properly limit user display names which could allow a malicious users to overload the backing database and cause a denial of service. It is recommended that the Nextcloud Server is upgraded to 22.2.10, 23.0.7 or 24.0.3. There are no known workarounds for this issue.

Weakness: CWE-400 (Uncontrolled Resource Consumption), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2022-39346?

It affects 3 products.


Products: Fedoraproject Fedora, Nextcloud Nextcloud Enterprise Server, Nextcloud Nextcloud Server.

## How do I fix CVE-2022-39346?

Upgrade to a fixed version.

## Is CVE-2022-39346 being exploited?

There is no known exploitation of CVE-2022-39346 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-2022-39346 and fix it if it is affected.

What it is: CVE-2022-39346 is a low-severity denial of service vulnerability in Fedoraproject Fedora, published on 25 Nov 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2022-39346 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-2022-39346/ (Markdown: https://insights.sbomify.com/CVE-2022-39346/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-39346
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-39346
- OSV: https://osv.dev/vulnerability/CVE-2022-39346

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-39346/
Summaries are generated and may contain mistakes; the official description above is the record.