# CVE-2026-51106: Deserialization in n/a

> A local attacker can cause a denial of service in the qTox client through a vulnerability in the serialization component.

- **Severity:** Critical 9.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N`)
- **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:** 26 Aug 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-wq69-v2pv-fr6p

## What is CVE-2026-51106?

CVE-2026-51106 is a critical unsafe deserialization vulnerability in n/a, published on 26 Aug 2026. 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

An issue in TokTok qTox v1.18.4 allows a local attacker to cause a denial of service via the src/persistence/serialize.cpp component

Weakness: CWE-502 (Deserialization of Untrusted Data), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-51106?


## How do I fix CVE-2026-51106?

No fix has been published for CVE-2026-51106 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-51106 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51106 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-51106 and fix it if it is affected.

What it is: CVE-2026-51106 is a critical unsafe deserialization vulnerability in n/a, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51106 exists.

Affected product: n/a. 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-2026-51106/ (Markdown: https://insights.sbomify.com/CVE-2026-51106/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-51106
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-51106
- OSV: https://osv.dev/vulnerability/CVE-2026-51106

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-51106/
Summaries are generated and may contain mistakes; the official description above is the record.