# CVE-2026-27476: RustFly 2.0.0 Command Injection via UDP Remote Control

> Attackers can execute arbitrary system commands on RustFly devices by sending crafted UDP packets to the remote control interface.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Feb 2026
- **Updated:** 20 Feb 2026
- **Also known as:** GHSA-2fw7-qxr6-mwq7

## What is CVE-2026-27476?

CVE-2026-27476 is a critical command injection vulnerability in Bixat RustFly, published on 19 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

RustFly 2.0.0 contains a command injection vulnerability in its remote UI control mechanism that accepts hex-encoded instructions over UDP port 5005 without proper sanitization. Attackers can send crafted hex-encoded payloads containing system commands to execute arbitrary operations on the target system, including reverse shell establishment and command execution.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-27476?


## How do I fix CVE-2026-27476?

No fix has been published for CVE-2026-27476 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27476 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27476 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27476 and fix it if it is affected.

What it is: CVE-2026-27476 is a critical command injection vulnerability in Bixat RustFly, published on 19 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27476 exists.

Affected product: Bixat RustFly. 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-2026-27476/ (Markdown: https://insights.sbomify.com/CVE-2026-27476/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27476
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27476
- OSV: https://osv.dev/vulnerability/CVE-2026-27476

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27476/
Summaries are generated and may contain mistakes; the official description above is the record.