What is CVE-2026-27476?

CVE-2026-27476 is a critical-severity vulnerability in Bixat Rustfly, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-02-19.

How severe is CVE-2026-27476?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Bixat Rustfly

CVE-2026-27476

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.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.026 (83.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Bixat Rustfly — versions 2.0.0

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-27476?: CVE-2026-27476 is a critical-severity vulnerability in Bixat Rustfly, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-02-19.
How severe is CVE-2026-27476?: Critical severity. CVSS v3 base score is 9.8 out of 10.