About Me

I am Jaeyeong Lee, a South Korean security researcher and CTF player. I mainly work on security research projects and have a strong interest in automatically discovering vulnerabilities. I’m also deeply interested in every field that operates on computers.

Education
Sunrin Internet Highschool, Information Security (2023.3 ~ 2026.2)Seoul Women's Univ, Cybersecurity Gifted Education (2024.05 ~ 2024.11)

Experience

  • HSPACE
    Field Trainee
    2025.07 ~ 2025.08
  • Korea Univ. Blockchain Valley
    Security Team (Research)
    2025.03 ~ 2025.07
  • Sunrin Internet Highschool
    Information Security
    2023.03 ~ 2026.02

News

Mar 2026Participating in SECCON CTF Finals 2026 (Tokyo).
Feb 2026Accepted to KCSE 2026 (Ulsan).
Aug 2025Finalist in DEFCON 33 CTF (Las Vegas).

Publications

  • ExplosionGuard: Policy Synthesis and Guardrails for Budget-Constrained Symbolic Execution
    Jaeyeong Lee and GeonWoo Lee
    Korea Conference on Software Engineering (KCSE), 2026
View All Publications →

Vulnerability Research

  • CVE-2026-21897 (NASA CryptoLib)
    Out-of-bounds write in GVCID managed parameters (CVSS 7.3)
  • CVE-2026-21898 (NASA CryptoLib)
    Out-of-bounds read in AOS frame parsing (CVSS 7.5)
  • CVE-2025-14876 (QEMU)
    Denial of Service in virtio device emulation (CVSS 5.5)
View All Research →

Honors & Awards

  • 20251st Place, Holyshield CTF 2025
  • 20258th Place, DEFCON 33 Final
  • 2024KORAIL Vulnerability Award
View All Honors →

Projects

Blind penetration test for Hyundai Mobis overseas subsidiaries

2025.09.22 ~ 2025.11.14

Automated Analysis of IoT Vulnerabilities with Taint Analysis

Research project focusing on detecting vulnerabilities in IoT devices using taint analysis techniques.

Intelligent Traffic Analysis Training Data Generation — Cyber Operations Command

Generated standard and malicious traffic datasets for training intelligent analysis models.
View All Projects →