$ ctf42

#heap-overflow CTF challenges

28 CTF challenges using heap-overflow from 23 CTFs (2017–2026), 28 with writeups. Mostly Misc (50%) and Pwn (50%).

Misc · 14 Pwn · 14

Often combined with

#tcache 5 #overlapping-chunks 2 #libc-leak 2 #one-gadget 2 #got-overwrite 2 #aes-ctr-keystream-recovery 1 #malloc-hook 1 #fastbin-attack 1 #calloc-mmap-bit-leak 1 #glibc-2.31 1 #free-hook-overwrite 1 #pointer-chunk-overwrite 1 #arbitrary-read-write 1 #libc-2.35 1 #free-hook 1

Challenges

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Challenge CTF Weight Category Has
Unintended
#strlen-overflow#heap-overflow#tcache
 RaRCTF 2021 24.53 Pwn files wu 3
soda_pop_bop
#house-of-force#heap-overflow
 rgbCTF 2020 19.74 Misc files wu 3
violence-fixer
#heap-overflow#tcache
 TSG 2020 – Misc files wu 3
shop
#heap-overflow#got-overwrite#one-gadget
 PlaidCTF 2018 90.83 Misc files wu 3
super_marimo
#heap-overflow#got-overwrite#one-gadget
 Codegate 2018 Quals 25.00 Misc files wu 3
Diary
#heap-overflow#fastbin-attack#overlapping-chunks#malloc-hook
 Balsn 2020 25.00 Misc files wu 3
CShell
#heap-overflow
 corCTF 2021 24.92 Pwn files wu 3
Little-Alchemy
#heap-overflow
 m0leCon 2021 Quals 24.55 Pwn files wu 3
Oldnote
#negative-size#heap-overflow#stdout-file-leak#free-hook
 PoseidonCTF 2020 – Misc files wu 2
Suffarring
#heap-overflow#tcache
 PlaidCTF 2019 95.72 Misc files wu 2
Pokemon
#tcache-stashing-unlink#heap-overflow#null-byte-bypass
 RCTF 2021 – Pwn files wu 1
meowmow
#kernel-exploitation#out-of-bounds (oob)#heap-overflow
 zer0pts 2020 24.56 Misc files wu 1
oboe
#kernel#heap-overflow#off-by-one#use-after-free (uaf)#rop#commit-creds#kpti-bypass
 DiceCTF 2025 Quals 81.00 Pwn files wu 1
blackout
#integer-truncation#heap-overflow
 SECCON 2023 Quals 100.00 Pwn files wu 1
catch_the_frog
#integer-overflow#heap-overflow
 RCTF 2021 – Pwn files wu 1
Learning_OOP
#heap-overflow#vtable#safe-linking-bypass
 SekaiCTF 2025 55.00 Pwn files wu 1
heap01
#heap-overflow#tcache-corruption
 SunshineCTF 2024 38.57 Pwn files wu 1
Shop_Manager
#heap-overflow#tcache
 COMPFEST 2021 – Pwn files wu 1
roshambo
#heap-overflow#tcache
 WMCTF 2020 – Misc files wu 1
notebook
#heap-overflow#pointer-chunk-overwrite#arbitrary-read-write#libc-2.35
 CYBERGON 2023 – Pwn files wu 1
TheShowMustGoOn
#heap-overflow#function-pointer-overwrite#ret2win
 UMDCTF 2022 – Pwn files wu 1
death_note
#heap-overflow#fd-overwrite#libc-leak
 Securinets 2021 Quals 41.71 Pwn files wu 1
notes
#heap-overflow#calloc-mmap-bit-leak#libc-leak#free-hook-overwrite#glibc-2.31
 CSCML 2020 – Misc files wu 1
baby_mac
#heap-overflow#arbitrary-write#hook-overwrite
 WMCTF 2020 – Misc files wu 1
securenote
#heap-overflow#aes-ctr-keystream-recovery#overlapping-chunks
 Balsn 2019 25.00 Misc files wu 1
netatalk
#heap-overflow
 HITCON 2019 Quals 92.94 Misc files wu 1
damocles
#heap-overflow
 HITCON 2017 Quals 69.38 Misc files wu 1
down_the_line
#bootsector-pwn#heap-overflow
 TRX 2026 – Pwn files wu 1