CTF Time

Name: ZeroDayTM CTF (an ZDTM CTF event.)
Date: May 23, 2026, 7 a.m. — 23 May 2026, 15:00 UTC  [add to calendar]
Format: Jeopardy
On-site
Location: ICAM UVT, Timisoara, Romania
Offical URL: https://ctf.info.uvt.ro/invite/ckhbsit2kfmk
Rating weight: 0
Event organizers: ZeroDayTM

Name: Panther CTF 2026 (an SecLeaf CTF event.)
Date: May 23, 2026, 8:30 a.m. — 24 May 2026, 08:30 UTC  [add to calendar]
Format: Jeopardy
On-line
Location: Online
Offical URL: http://pantherctf.secleaf.tech/
Rating weight: 0
Event organizers: SecLeaf

Name: LakeCTF Finals 25-26 (an LakeCTF event.)
Date: May 1, 2026, 7 a.m. — 01 May 2026, 15:00 UTC  [add to calendar]
Format: Jeopardy
On-site
Location: Switzerland, Lausanne
Offical URL: https://ctfnew.polygl0ts.ch/
Rating weight: 54.00
Event organizers: polygl0ts

Name: DEF CON CTF Qualifier 2026 (an DEF CON CTF Qualifier event.)
Date: May 22, 2026, 9 p.m. — 24 May 2026, 21:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://bbbirds.org/
Rating weight: 63.22
Event organizers: Benevolent Bureau of Birds

Name: Hack4Krak CTF 2026 - High School Edition (an Hack4Krak event.)
Date: May 23, 2026, 8 a.m. — 24 May 2026, 14:00 UTC  [add to calendar]
Format: Jeopardy
On-site
Location: Poland, Cracow
Offical URL: https://hack4krak.pl/
Rating weight: 0
Event organizers: Hack4Krak

Name: SecLeaf Q2 CTF 2026 (an SecLeaf CTF event.)
Date: May 23, 2026, 2 p.m. — 24 May 2026, 14:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Location: International
Offical URL: http://secleaf.tech/
Rating weight: 0
Event organizers: SecLeaf

Name: ZEROBREACH CTF (an ZEROBREACH CTF event.)
Date: May 24, 2026, 4:30 a.m. — 24 May 2026, 16:30 UTC  [add to calendar]
Format: Jeopardy
On-line
Location: ONLINE
Offical URL: http://ctf.cyberspacevr.in/
Rating weight: 0.00
Event organizers: CyberSpaceVR

Name: Hack for a Change 2026 May: UN SDG 1 (an Hack for a Change event.)
Date: May 19, 2026, midnight — 21 May 2026, 23:59 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://www.hackforachange.org/
Rating weight: 24.53
Event organizers: Hack for a Change

Name: SamaraCTF 2026 (an SamaraCTF event.)
Date: May 15, 2026, 3 p.m. — 17 May 2026, 15:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://samara.volgactf.ru/
Rating weight: 25.00
Event organizers: SamaraCTF.ru

Name: 0xV01D CTF 2026 (an 0xV01D CTF event.)
Date: May 18, 2026, 4 a.m. — 20 May 2026, 04:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://0xv01d-ctf.xyz/
Rating weight: 19.29
Event organizers: OxV01D

Name: NorthSec 2026 (an NorthSec CTF event.)
Date: May 15, 2026, midnight — 17 May 2026, 23:00 UTC  [add to calendar]
Format: Hack quest
On-site
Location: Canada, Montreal
Offical URL: https://nsec.io/competition/
Rating weight: 0.00
Event organizers: NorthSec Organizers

Name: TJCTF 2026 (an TJCTF event.)
Date: May 15, 2026, 4 p.m. — 17 May 2026, 16:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://tjctf.org/
Rating weight: 65.05
Event organizers: tjcsc

Name: UralCUP 2026 // Quals (an UralCUP event.)
Date: May 17, 2026, 5 a.m. — 17 May 2026, 13:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Location: Russia
Offical URL: https://uralctf.org/
Rating weight: 0
Event organizers: TyumGUard

Name: NDIAS Automotive/IoT CTF (an NDIAS Automotive/IoT CTF event.)
Date: May 15, 2026, 9 a.m. — 17 May 2026, 09:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://ctf.ndias.jp/
Rating weight: 25.00
Event organizers: cartagaitai

Name: DaVinciCTF 2026 (an DaVinciCTF event.)
Date: May 16, 2026, 8 a.m. — 16 May 2026, 17:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://dvc.tf/
Rating weight: 32.59
Event organizers: DaVinciCode

Name: RAMunchers CTF (an RAMunchers CTF event.)
Date: May 10, 2026, 8 a.m. — 13 May 2026, 15:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://ctf.ramunchers.com/
Rating weight: 23.30
Event organizers: R0073R5

Name: Midnight Sun CTF 2026 Quals (an Midnight Sun CTF event.)
Date: May 10, 2026, 1 p.m. — 11 May 2026, 13:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://play.midnightsunctf.com/
Rating weight: 48.17
Event organizers: HackingForSoju

Name: PHONIX VIPER NOVA CTF#2 (an PH03N1X V1P3R N0V4 CTF event.)
Date: May 8, 2026, 10 a.m. — 10 May 2026, 17:00 UTC  [add to calendar]
Format: Jeopardy
On-site
Location: Romania, Bucharest
Offical URL: http://pwnctf.ro/
Rating weight: 0.00
Event organizers: PH03N1X V1P3R N0V4 CTF

Name: Azure Assassin Alliance CTF 2026 (an Azure Assassin Alliance CTF event.)
Date: May 10, 2026, 1 a.m. — 11 May 2026, 01:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://actf2026.xctf.org.cn/
Rating weight: 45.60
Event organizers: 欸欸欸

Name: Break The Syntax CTF 2026 (an Break the Syntax CTF event.)
Date: May 8, 2026, 4 p.m. — 10 May 2026, 10:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Location: Wrocław, Poland
Offical URL: https://bts2026.wh.edu.pl/
Rating weight: 56.25
Event organizers: PWr Synt@x Err0r