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2026picoctfsolutions.compicoCTF

picoCTF 2026

70 challenges with 70 published solutions between them. Solution links go to picoctfsolutions.com, which is the only writeup source this index uses for picoCTF - one worked solution per challenge, rather than an aggregate of other people’s posts.

Every writeup on picoctfsolutions.com

Misc21

Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.

Solve it with:Brainfuck and esolang decoderCipher identifier and automatic decoderRegex tester with match offsets and capture groupsLearn: Recognising encodings

Cryptography12

Recover a plaintext or a key from something that was supposed to protect it. In practice: identify the scheme, find the parameter the author got wrong, exploit it.

Solve it with:Cipher identifier and automatic decoderVigenere cipher solver with automatic key recoveryRSA decryption and attack runnerWiener’s attack on small RSA private exponentsIn-browser hash cracker with rule transformsLearn: Classical ciphers and frequency analysisLearn: RSA and the parameters that break it

Reverse engineering11

Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.

Solve it with:Strings extractor for binaries and blobsWebAssembly disassemblerJava .class disassemblerPython .pyc bytecode disassemblerLearn: Binary exploitation

  • Autorev 1

    1 writeup
    • decompilation
    • binary-analysis

  • Binary Instrumentation 3

    1 writeup
    • frida

  • Binary Instrumentation 4

    1 writeup
    • frida

  • Bypass Me

    1 writeup
    • binary-analysis
    • strings
    • patching

  • Gatekeeper

    1 writeup
    • decompilation
    • anti-debugging

  • Hidden Cipher 1

    1 writeup
    • custom-cipher
    • classical-cipher

  • Hidden Cipher 2

    1 writeup
    • custom-cipher
    • classical-cipher

  • JITFP

    1 writeup
    • timing-attack
    • side-channel

  • Secure Password Database

    1 writeup
    • strings
    • binary-analysis
    • xor

  • Silent Stream

    1 writeup
    • pcap-analysis
    • encoding

  • The Add/On Trap

    1 writeup
    • source-inspection
    • encoding
    • javascript-deobfuscation

Web10

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: Web attacks and session tokens

  • Credential Stuffing

    1 writeup
    • credential-stuffing
    • authentication-bypass

  • Fool the Lockout

    1 writeup
    • authentication-bypass
    • credential-stuffing

  • Hashgate

    1 writeup
    • authentication-bypass
    • hash-cracking

  • No FA

    1 writeup
    • authentication-bypass
    • totp

  • North-South

    1 writeup
    • network-bypass

  • Old Sessions

    1 writeup
    • cookie-manipulation
    • authentication-bypass

  • ORDER ORDER

    1 writeup
    • sql-injection

  • paper-2

    1 writeup
    • xslt-injection
    • side-channel

  • Secret Box

    1 writeup
    • sql-injection
    • second-order-sqli

  • Sql Map1

    1 writeup
    • sql-injection

Binary exploitation8

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

Forensics8

Recover something from a file, a capture, or a disk image - often from a part of it the format says is unused.

Solve it with:File type identifier by magic bytesMagic byte and file signature tablePCAP analyzer for CTF network forensicsEXIF metadata viewerLearn: File forensics and carvingLearn: Network forensics

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