CTF Time

Name: Hardwear.io USA 2026 Hardware CTF (an Hardware CTF event.)
Date: May 29, 2026, 5 p.m. — 30 May 2026, 20:50 UTC  [add to calendar]
Format: Jeopardy
On-site
Location: US, Santa Clara
Offical URL: https://hwc.tf/
Rating weight: 0.00
Event organizers: Hardware CTF by Quarkslab

Name: BYUCTF 2026 (an BYUCTF event.)
Date: May 30, 2026, midnight — 31 May 2026, 00:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://ctfd.cyberjousting.com/
Rating weight: 53.29
Event organizers: BYU Cyberia

Name: Grey Cat The Flag 2026 Qualifiers (an Grey Cat The Flag event.)
Date: May 30, 2026, 2 a.m. — 31 May 2026, 02:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Location: Singapore
Offical URL: https://ctf.nusgreyhats.org/
Rating weight: 47.50
Event organizers: NUSGreyhats

Name: WhiteHats TrojanCTF 2026 (an TrojanCTF event.)
Date: May 30, 2026, 9 a.m. — 30 May 2026, 19:00 UTC  [add to calendar]
Format: Jeopardy
On-site
Location: Netherlands, Eindhoven
Offical URL: https://eshatrojan.nl/trojanctf
Rating weight: 0.00
Event organizers: E.S.H.A. Trojan

Name: bhackari CTF 2026 (an bhackari CTF event.)
Date: May 30, 2026, 10 a.m. — 31 May 2026, 10:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://ctf.bhackari.it/
Rating weight: 24.75
Event organizers: bhackari

Name: Hackअस्त्र (an Hackअस्त्र CTF Qualifiers event.)
Date: May 29, 2026, 10:15 a.m. — 30 May 2026, 17:15 UTC  [add to calendar]
Format: Jeopardy
On-line
Offical URL: https://ctf.hackastra.tech/
Rating weight: 25.00
Event organizers: Ethical HCK

Name: HSE CTF 2026 (an HSE CTF event.)
Date: May 30, 2026, 7 a.m. — 30 May 2026, 13:00 UTC  [add to calendar]
Format: Jeopardy
On-site
Location: Moscow, Russia
Offical URL: https://ctf.miem.hse.ru/
Rating weight: 0.00
Event organizers: HSE CTF Crew

Name: Pwn2Play Open CTF (an Pwn2Play Open CTF event.)
Date: May 30, 2026, 9 a.m. — 30 May 2026, 18:00 UTC  [add to calendar]
Format: Jeopardy
On-line
Location: DMU Leicester & Online
Offical URL: https://pwn2play.biterra.co/
Rating weight: 0
Event organizers: DMUHackers26

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: 0.00
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: 19.66
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