July 2026: LedgerHQ/ledger-secure-sdk fuzzing pipeline was hardened and expanded, and framework docs were upgraded. Key features delivered include a consolidated fuzzing build script (cfl-build.sh), corpus zip support with compatibility key validation, fuzzing dependency upgrades, optional cleanup callback, and robust multi-target seed handling with stateless TLV grammar configuration and sanitizer hardening. Major bugs fixed included UBSan/MSan crashes in sdk-fuzz and hardening against Absolution SIGSEGV, along with an optional cleanup toggle and improved seed pinning. The net effect is more reliable, secure fuzz testing, faster vulnerability discovery, and easier maintenance, demonstrated through improved build tooling and comprehensive Doxygen docs for the fuzzing framework and public headers. Technologies and skills demonstrated include fuzzing tooling (ClusterFuzzLite), UBSan/MSan sanitizers, build script automation, corpus management, multi-target fuzzing, and Doxygen-based documentation.

June 2026 monthly summary for LedgerHQ/ledger-secure-sdk focusing on safety, reliability, and fuzzing readiness. Delivered targeted memory-safety fixes addressing UBSan-reported undefined behavior and introduced a stateful fuzzing framework to drive global state coverage for the SDK and associated apps. These efforts reduce undefined-behavior risk, improve crash resilience, and establish a scalable testing pipeline for future hardening and product releases.