2026 - KalmarCTF is back for its 4th year!

calendar March 27, 2026 · 2 min read · linkedin KalmarCTF hacking  ·
Share on: linkedin copy

Hack with us tonight and all weekend at KalmarC.TF 🚀

KalmarC.TF is back for its 4th year!

Join us at https://kalmarC.TF for a weekend of hacking, learning, and fun.

As always, we have some great prizes up for grabs, including Hex-Rays IDA licenses and prizes from Zellic.

KalmarCTF 2026 promotional image

This year, KalmarC.TF 2026 once again features a broad range of challenges, including:

  • Web exploitation
  • Reverse engineering
  • Binary exploitation
  • Cryptography
  • Multidisciplinary challenges

KalmarC.TF is still not a beginner CTF - but this year, more than ever, it can still be a great learning experience. With the rise of LLMs, teams and players who may not be experts in every category can use them to better understand challenge concepts, explore new areas, and level up along the way.

Of course, having an LLM solve everything for you is not the point. But using it to learn from the challenges our Kalmarunionen authors have built might be exactly what gets you hooked on #CTF - or helps take your skills to the next level.

We are also experimenting with some low-usage LLM ideas for more established teams. Consider this a bit of a trial balloon - details are available in our Discord channel.

Come join us, hack away, learn some new tricks, and have fun with your favorite Nordic team.

If you would like to support #Kalmarunionen, reach out to Rolf Lunn or Morten Eskildsen on LinkedIn, or contact us at sponsor@kalmarunionen.dk.