Low-Level Systems • Vulnerability Discovery • Advanced Fuzzing (AFL++)

Low-Level Systems Programmer & Vulnerability Fuzzing Specialist

Name: El Kantara PDF Reader
Author: GUIAR OQBA

I am GUIAR OQBA — a low-level programmer specializing in C, C++, and Assembly systems and offensive cybersecurity. My core focus is uncovering deep software vulnerabilities through advanced fuzzing frameworks like AFL++ and custom-developed fuzzing tools, alongside building native software and high-performance mobile apps.

C / C++ / x86-64 & ARM ASM AFL++ & Custom Fuzzers Vulnerability Discovery Android App Development

Engineering Services & Work Discovered Vulnerabilities Start a Project

VERIFIED VULNERABILITY GitLab ↗

Samba Library Vulnerability Discovery

Discovered and patched a CTDB socket security flaw, officially merged by the Samba Team (MR !4239).

CREDITED AS okba14 GitHub ↗

Zero-Breach Vulnerability Discovery

Uncovered a security flaw in Zero-Breach on GitHub with official upstream acknowledgment to okba14 (PR #8).

PUBLISHED MOBILE APP Google Play ↗

El Kantara PDF Reader App

Fast, lightweight Android PDF reader engineered and published on the Google Play Store.

Services & Work

Engineering Services & Work

Clear, specialized software engineering in C/C++/Assembly, advanced vulnerability fuzzing, and mobile application development backed by published work.

Core Service

Vulnerability Discovery & Advanced Fuzzing

Deep security auditing and automated vulnerability discovery in C/C++ libraries and system binaries using advanced fuzzing frameworks like AFL++ alongside custom-engineered fuzzing tools.

What I Deliver:

Coverage-guided fuzzing campaigns with AFL++, LibFuzzer, and custom mutators
Custom fuzzing harnesses & proprietary crash-triaging tools built from scratch
Memory corruption analysis (Buffer Overflows, Use-After-Free, IPC desync)
Source code auditing, reverse engineering (GDB, Radare2), and responsible disclosure

Featured Work & Official Proof:

Samba Vulnerability Acknowledgment (GitLab MR !4239) Upstream Fix ↗ Zero-Breach Vulnerability Credit (@okba14 — GitHub PR #8) Credited @okba14 ↗

AFL++Custom FuzzersASan / UBSanGDB / Radare2CVE / Advisory Research

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Core Service

Low-Level Programming (C / C++ / Assembly)

Engineering ultra-fast, lightweight, and memory-safe software directly at the machine level in C, C++, and Assembly—free from bloated abstractions.

What I Deliver:

High-performance native engines, system daemons, and CLI utilities in C/C++
x86-64 & ARM64 Assembly optimization and SIMD vectorization (AVX2 / SSE)
Linux & POSIX systems programming (sockets, mmap, epoll, io_uring)
Native C/C++ addons and bridges for high-level runtimes (Node-API / FFI)

Featured Work & Official Proof:

Explore Open-Source C & Assembly Projects on GitHub (@okba14) GitHub ↗

C99 / C11C++20x86-64 / ARM ASMLinux / POSIXSIMD

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Core Service

High-Performance Mobile App Development

Designing and building fast, clean, and reliable mobile applications with a low-level engineer’s mindset: minimal memory footprint, instant startup, and smooth user experience.

What I Deliver:

Full-cycle Android application development from architecture to Google Play release
High-speed document rendering, PDF processing, and offline-first utilities
Lightweight, responsive UI design focused on simplicity and user clarity
Strict privacy, local data security, and crash-free native stability

Featured Work & Official Proof:

Published App: El Kantara PDF Reader on Google Play Store Google Play ↗

Android DevelopmentGoogle Play ProductionNative PerformanceClean UI/UX

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View Engineering Services & Work

Vulnerabilities & Research

Discovered Vulnerabilities & Security Research

Acknowledged upstream vulnerability disclosures in major open-source projects (Samba, Zero-Breach) and peer-reviewed cryptographic research.

Official Samba Merge Request 2024–2025

Samba Team (GitLab MR !4239)

Samba CTDB Socket Handling Vulnerability — Upstream Acknowledgment

Discovered and responsibly disclosed a security flaw in Samba's Clustered Trivial Database (CTDB) socket handling and IPC lifecycle management, officially merged and acknowledged by the Samba Team.

Technical Impact & Verification:

Fixed socket descriptor and path handling issues in clustered Samba deployments, preventing IPC desynchronization and potential local security boundary violations.

SambaC AuditingCTDB SocketFuzzingIPC SecurityUpstream Patch

vulnerability-disclosure

Credited Vulnerability (@okba14) 2025

Zero-Breach Upstream (GitHub PR #8)

Zero-Breach Security Vulnerability Discovery — Credited as @okba14

Identified, reported, and helped remediate a critical security vulnerability in the Zero-Breach project on GitHub, receiving official upstream acknowledgment and documentation under handle @okba14.

Technical Impact & Verification:

Uncovered and resolved a security vulnerability in Zero-Breach, strengthening memory and execution safety with direct upstream attribution to @okba14.

Zero-BreachVulnerability DiscoveryFuzzingSecurity Auditokba14GitHub Advisory

vulnerability-disclosure

View All Discovered Vulnerabilities & Research (4)

Engineering Principle

"Real expertise is proven by results: uncovering real vulnerabilities in critical codebases through deep fuzzing, and shipping fast, reliable software that users can test and verify."