What's the vulnerability?

GNU InetUtils telnetd versions 1.9.3 through 2.7 accept the USER environment variable from telnet clients and pass it directly to login(1) without sanitization.

Root Cause Analysis
One Command

Verify with pruva-verify

Run the Pruva CLI to automatically fetch and execute the reproduction script.

pruva-verify REPRO-2026-00077
Install: curl -fsSL https://pruva.dev/install.sh | sh

Or Run Manually

1

Download the script

curl -O https://pruva.dev/api/v1/reproductions/REPRO-2026-00077/artifacts/bundle/repro/reproduction_steps.sh
2

Make executable

chmod +x reproduction_steps.sh
3

Run the script

./reproduction_steps.sh
Run in a VM, container, or disposable environment. This exploits a real vulnerability.

How Pruva Reproduced This

Watch the AI agent's step-by-step process.

Loading session...