2026from public repositories
JDHACK 2026
7 challenges with 7 published solutions between them. The writeups for this event were found in public repositories. Each link is pinned to the commit it was read from.
Where these writeups liveWeb6
Reach data or functionality the application meant to keep from you - through its inputs, its tokens, or its trust in the client.
Solve it with:JWT decoder and signature verifierJWT alg=none bypass generatorWeb attack payload catalogJWT secret brute forceLearn: Sessions, tokens and access control
Http Dungeon
1 official solutionAlso written up in: noahbal/CTF-WriteUps
Ocarina
1 official solutionAlso written up in: noahbal/CTF-WriteUps
Ocarina2
1 official solutionAlso written up in: noahbal/CTF-WriteUps
Pacman
1 official solutionAlso written up in: noahbal/CTF-WriteUps
Pacman2
1 official solutionAlso written up in: noahbal/CTF-WriteUps
Pacman3
1 official solutionAlso written up in: noahbal/CTF-WriteUps
Binary exploitation1
Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.
Solve it with:ROP gadget finderShellcode assembler and libraryCyclic pattern generator and offset finderFormat string exploit builderLearn: Binary exploitation
Sum Service
1 official solutionAlso written up in: noahbal/CTF-WriteUps