# CVE-2022-39264: nheko vulnerable to secret poisoning using MITM on secret requests by the homeserver

> A malicious homeserver can poison secrets in nheko via MITM, bypassing verification and potentially exposing sensitive data.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 Sep 2022
- **Updated:** 23 Apr 2025
- **Also known as:** DEBIAN-CVE-2022-39264, GHSA-8jcp-8jq4-5mm7, UBUNTU-CVE-2022-39264

## What is CVE-2022-39264?

CVE-2022-39264 is a high-severity vulnerability in Fedoraproject Fedora, published on 28 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

nheko is a desktop client for the Matrix communication application. All versions below 0.10.2 are vulnerable homeservers inserting malicious secrets, which could lead to man-in-the-middle attacks. Users can upgrade to version 0.10.2 to protect against this issue. As a workaround, one may apply the patch manually, avoid doing verifications of one's own devices, and/or avoid pressing the request button in the settings menu.

Weakness: CWE-295 (Improper Certificate Validation), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2022-39264?

It affects 2 products.


Products: Fedoraproject Fedora, Nheko-Reborn Nheko.

## How do I fix CVE-2022-39264?

Upgrade to a fixed version.

## Is CVE-2022-39264 being exploited?

There is no known exploitation of CVE-2022-39264 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-2022-39264 and fix it if it is affected.

What it is: CVE-2022-39264 is a high-severity vulnerability in Fedoraproject Fedora, published on 28 Sep 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-2022-39264 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-2022-39264/ (Markdown: https://insights.sbomify.com/CVE-2022-39264/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-39264
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-39264
- OSV: https://osv.dev/vulnerability/CVE-2022-39264

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-39264/
Summaries are generated and may contain mistakes; the official description above is the record.