Sangwon Ryu

유상원

Computer Science and Engineering Student @ Soongsil University

Education

Computer Science and Engineering, Soongsil University

Mar 2023 – Present

  • Clubs and Societies: SCCC
  • Organized and set problems for 2024 SCON, an in-school algorithm contest

Experience

KISA BoB 15th

Jul 2026 – Present

  • Track: Vulnerability Research

Republic of Korea Air Force – Cybersecurity Specialist (Sergeant)

Jul 2024 – Mar 2026

  • Performed security monitoring and server administration at the CERT
  • Developed a security update management tool in an air-gapped environment

Software Maestro 14th

Apr 2023 – Nov 2023

  • Team: 새싹들(Daehyun Kang, Sangwon Ryu, Suyoung Hwang)
  • Led backend development across the full lifecycle, from planning to deployment

Projects

Haetae

A functional DSL for heterogeneous computing

Feb 2026 – Present

  • Developing the semantic analysis pipeline and MLIR generator pipeline
  • Used libFuzzer to identify and fix stability issues in the parser

Collectime

An optimized group scheduling service

Apr 2023 – Nov 2023

  • Designed and implemented RESTful APIs using Kotlin and Spring Framework
  • Built a CI/CD pipeline and automated Docker image build and deployment
  • Implemented a batch-based calendar synchronization system

Vulnerability Disclosure

LizardByte/Sunshine

CVE-2026-32253 · 9.8 Critical (v3.1)

May 2026

  • Authentication bypass via improper client certificate validation
  • GitHub Security Advisory: GHSA-ph75-mgxh-mv57

containerd

CVE-2026-53489 · 8.2 High (v4.0)

Jun 2026

  • Arbitrary host file read via symlink following in CRI checkpoint restore
  • GitHub Security Advisory: GHSA-rgh6-rfwx-v388

Competitions

2026 KISIA CTF – 3rd Place

Aug 2026

  • Team: realsungsFanclub
  • Awarded by the President of KISIA (Korea Information Security Industry Association)

DEF CON 34 CTF Finals – 7th Place

Aug 2026

  • Team: Jinddabi's
  • Focused on patch analysis and exploit development on Attack & Defense challenges

2026 HackTheon Sejong – 5th Place, Excellence Award (Beginner Division)

Jul 2026

  • Team: 15자 이내로 팀 특성을 잘
  • Awarded by the President of the Science and Technology Policy Institute (STEPI)

2026 INCOGNITO Ideathon: Privacy Protection in the AI Era – Bronze Award

May 2026

  • Team: underFlow

2026 INCOGNITO CTF – 24th Place (Quals)

Feb 2026

  • Team: 할렐야루

University Student AI System Trading Challenge – Excellence Award

Feb 2026

  • Individual
  • Awarded by the Director of Soongsil University AI Bootcamp Program

47th Air Force ICT Competition (Hacking Defense Division) – 1st Place

Dec 2025

  • Individual
  • Awarded by the Republic of Korea Air Force Chief of Staff

WhiteHat 2025 Contest – 1st Place (Enlisted Division)

Nov 2025

  • Team: 화잇짜
  • Awarded by the Minister of National Defense, Republic of Korea

Financial Security Institute FIESTA 2025 – 13th Place

Sep 2025

  • Team: 27일날세계불꽃축제...

Military Startup Contest – Merit Award

Sep 2025

  • Team: ArchiFlow
  • Awarded by the Director of the Military Outplace Training Institute

Cyber Conflict Exercise 2025 – 4th Place (Public Sector Division)

Sep 2025

  • Team: 곤운

Air Force Startup Contest – Merit Award

Jun 2025

  • Team: ArchiFlow
  • Awarded by the Republic of Korea Air Force Deputy Chief of Staff for Personnel

2025 HackTheon Sejong – 26th Place

Apr 2025

  • Team: 퉁퉁퉁 사후르

WhiteHat 2024 Contest – 4th Place (Enlisted Division)

Nov 2024

  • Team: 이곳이네집이다

2024 HackTheon Sejong – 30th Place

Apr 2024

  • Team: 몬스터에너지망고로코

HSpace Partners League – 3rd Place

Nov 2023

  • Team: Soongsil University ASC

CODEGATE 2023 – 14th Place

Jun 2023

  • Team: ASC

2023 UMDCTF – 8th Place (University Division)

May 2023

  • Team: SASC

2022 INCOGNITO CTF – 8th Place, Merit Award

Apr 2023

  • Individual

Soongsil University Hacking Defense Competition – 1st Place (Beginner Division)

Mar 2023

  • Individual
  • Awarded by the Dean of Soongsil University College of IT

Additional Experience

Incident Analysis and Response Support for a Nonprofit Organization

Apr 2026

  • Analyzed logs and system artifacts to identify attack vectors and incident timeline
  • Identified potentially affected applications and assessed risk of further compromise
  • Proposed follow-up actions including vulnerability mitigation, account resets, log preservation, and KISA reporting

Assistant Instructor, Computer Networking Department at Hanyang Technical High School

Jul 2023

  • Mentored teams on project idea refinement and development planning during a work-study training program
  • Supported troubleshooting of technical issues in web and game programming

Certifications

Industrial Engineer Information Security

Dec 2025

Korea Communications Agency (KCA)

Industrial Engineer Information Processing

Dec 2025

Human Resource Development Service of Korea (HRDK)

SQL Developer

Apr 2024

Korea Data Agency

TOEIC – Score: 960

Feb 2024

Korea TOEIC Committee

TOPCIT – Level 4 (Score: 688)

Oct 2023

Institute of Information & Communications Technology Planning & Evaluation (IITP)