---
title: "Discussion on \"Autobashn NexHunt CTF Writeup: Bypassing Bash Jails via Eval Injection\" | Hashnode"
description: "Discussion on \"Autobashn NexHunt CTF Writeup: Bypassing Bash Jails via Eval Injection\". Discover how to escape restricted shells in the Autobashn CTF. Learn to bypass regex whitelists and exploit eval logic using bash arithmetic expansion."
url: "https://hashnode.com/posts/autobashn-nexhunt-ctf-writeup-bypassing-bash-jails-via-eval-injection/693d997b195683a9620eb623"
---

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# [Autobashn NexHunt CTF Writeup: Bypassing Bash Jails via Eval Injection](https://ctfs.hashnode.dev/autobashn-nexhunt-ctf-writeup-bypassing-bash-jails-via-eval-injection?utm_source=hashnode&utm_medium=feed)

Discover how to escape restricted shells in the Autobashn CTF. Learn to bypass regex whitelists and exploit eval logic using bash arithmetic expansion.

Dec 13, 2025 · 4 min read · ctfs.hashnode.dev  
Updated Jan 1  
Read the article

-   [#bash-jail-escape](https://hashnode.com/tag/bash-jail-escape)
-   [#restricted-shell-bypass](https://hashnode.com/tag/restricted-shell-bypass)
-   [#ctf](https://hashnode.com/tag/ctf)
-   [#ctf-writeup](https://hashnode.com/tag/ctf-writeup)
-   [#capturetheflag](https://hashnode.com/tag/capturetheflag)
-   [#bash-script](https://hashnode.com/tag/bash-script)
-   [#jailbreak](https://hashnode.com/tag/jailbreak)
-   [#regex](https://hashnode.com/tag/regex)
-   [#eval](https://hashnode.com/tag/eval)
-   [#shell-scripting](https://hashnode.com/tag/shell-scripting)
-   [#nexhunt-ctf](https://hashnode.com/tag/nexhunt-ctf)

## Written by

[Null Siryn](https://hashnode.com/@nullsiryn)

@nullsiryn · Uttar Pradesh, India

  
[View profile](https://hashnode.com/@nullsiryn)

Read it. Don't Overthink it.

Barely Tame CTF Player. Debugging Addict. Worshipper of Wi-Fi Signals. Human? Depends on the Ping.

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