⏳ 4 days left. Practical Deep Dive into Kubernetes Security starts on Tuesday. ✔️ 6 weeks of hands-on labs ✔️ Your own Kubernetes cluster ✔️ Live sessions with security practitioners

That's why we want to first show all misconfigurations. Then we will show how to attack them. And then, obviously, we will teach you how to prevent them and stop attackers from abusing them. Use code K8S-HBS-10 for 10% off. hackarcana.com/q2-2026-k8s

Most Kubernetes security courses teach theory. This one is hands-on from day one: labs, real attack paths, RBAC abuse, runtime security, networking & container internals. Led live by experienced & certified security engineers 🔐 Use code K8S-HBS-10 for 10% off.

Two new RE exercises just dropped 🔥 🥉 RiskY Bronze 🥈 RiskY Silver A bit retro, on the simpler side, and focused on reversing compiled Python 2.7 internals. Have fun! hackarcana.com/exercises

Challenge down. Want to go deeper? Jump into a lab-based 6-week live security workshop covering build, deploy, runtime, RBAC, networking, and low-level container internals. Use code K8S-HBS-10 for 10% off.

Quick reminder: tomorrow at 7 PM CEST @gynvael.bsky.social is hosting a live walkthrough of the Cloud Security Challenge for Kubernetes with the authors. Demo Live Hacking + Q&A Sign up here: hackarcana.com/livestream-m...

We misconfigured a Kubernetes environment. On May 14th, we’ll show how it was broken. Live Hacking Demo + Q&A: K8s misconfigs, attack paths & privilege escalation. 👇 Link in comments

We misconfigured a K8s environment and today at 6 PM CEST, we open the challenge. What happens next depends on what you notice 🔍 Want to be there from the start? Sign up now. hackarcana.com/invite-29th-...

We set up a Kubernetes cluster. It looks fine at first glance. But one small detail changes everything. Will you be able to spot it? If you haven't joined yet, sign up for our "Cloud Security Challenge for Kubernetes"! 👉 link in the comment.

📣 Registration for the "Cloud Security Challenge for Kubernetes" is now open! Break into a vulnerable cluster, escalate privileges, and extract secrets – just like in real-world attacks. Free / Intermediate / ~2h / Hands-on / Starts April 29 Think you can break it? 👉 hackarcana.com/k8s-challenge

🚨 Learning C/C++? Beware of this classic trap: unspecified argument evaluation order! Different compilers = different results See why a specific tiny piece of code can behave wildly differently here hackarcana.com/code-print

🟢 It’s not too late to join us! The Mastering Binary Files and Protocols workshop starts tomorrow (Apr 8) at 6pm CEST. If you sign up today, you’ll still get: ✅ A spot in all of the live sessions ✅ Full access to all recordings ✅ 10% off with code MBF-HBS-10 Register here: hackarcana.com/bin

👇7 benefits of joining Mastering Binary Files and Protocols 👇 ✔️ Real binary skills ✔️ Faster debugging ✔️ Security mindset ✔️ Independence ✔️ Career boost ✔️ Problem-solving ✔️ Data insight 🗓️ Starts April 8 🎥 Live sessions + downloadable recordings 💸 MBF-HBS-10 = 10% off until April 7 🔗 hackarcana.com/bin

Come tonight at 7PM CEST! If you're into: 🧠 reverse engineering 🛠 understanding how things work 🧩 solving CTF-style puzzles — you'll love this session with @gynvael.bsky.social ! 🔴 www.youtube.com/live/xVrxfEk...

🚨 Last hours to join our free webinar with a legend – Gynvael Coldwind! What’s inside? • Real file handling mistakes • Weird path behavior • Hacker’s perspective on files • Even a bit of forensics 👀 🧩 Perfect for devs, admins, hackers & the curious. ⏳ Time’s running out → hexarcana.ch/lp/files

What will you learn in this webinar? 🧩 What is a file—really? 🧠 Hidden file features & common dev mistakes 📁 Weird world of file paths (yes, it gets strange) 🔍 A glimpse into digital forensics 🗓 March 31 | ⏰ 8 PM CEST | 💸 Free Save your spot 👉 hexarcana.ch/lp/files/ and see you on Monday!

🚨 <script> isn’t just text—it’s a command! Want it to show up in HTML? You have to escape it: ✅ <script> → &lt;script&gt; Escaping keeps hackers out and your code clean 🔐 Learn why it matters & how it works in our latest article 👇 🔗 Read here: hackarcana.com/article/why-...

If you like CTF challenges, we've been steadily pushing some of my favorite tasks to my new edu site: hackarcana.com/exercises From top to bottom: Linux RE, 2x JS RE, USB PCAP, ZIP/crypto, DOS/VGA RE, 2x BMP image stegano, 5x BMP file format stegano, Python 2.7 RE, and ROP RE HFGL

Did you know pressing CTRL+D can make some C++ programs crash or loop forever? 🤯 That’s because cin enters an error state instead of truly “closing” input. Most apps handle it well—but not all 🙅 Want to see why? Read our recent article 👉 hackarcana.com/article/ctrl...

We've published a new article! ⌨️ Linux Terminal: CTRL+D is like pressing ENTER hackarcana.com/article/ctrl... Enjoy!

Pro tip for protocol hand-crafting lovers: Having problems sending \r\n on Linux? Press CTRL+V to escape the next key press, and follow it up with ENTER to get \r. CTRL+V, ENTER, ENTER → \r\n

⚠️ Sanitizing input is tricky! Removing unwanted HTML tags prevents XSS, but won’t stop SQL injections. To keep your app safe, use validation, escaping, and sanitization where they belong 🔐 🔗 Read more here: hackarcana.com/article/sani...

We've got 200% increase in players overnight! Well, yes, it's 2→4 on the scoreboard, but we're just starting :) And we have more challenges on the way, a lot more!

For your enjoyment we're slowly adding @gynvael.bsky.social old challenges to our archive: hackarcana.com/exercises Slowly... becuase we test each one and re-flag them. Some fun ones are yet to come! Enjoy! P.S. If you like scoreboards, here's a chance to grab top1 easily.

🚀 New blog post on hackArcana! Learn about: 🔹 Validation vs. escaping vs. filtering 🔹 When to use each method 🔹 Common input handling mistakes 🔗 Read here: hackarcana.com/article/sani...

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