In April 2026, the LedgerHQ/ledger-secure-sdk team focused on stabilizing CI workflows and reducing branch deletion failures. Key fix: sanitized the head_ref variable in the branch deletion CI job to prevent issues in automated branch management. This change reduces CI flakiness and protects automated workflows from incorrect head_ref handling. Impact: more reliable CI operations, safer branch maintenance, and lower operational risk. Technologies/skills demonstrated: CI/CD scripting, Git-based workflows, code hygiene, and change validation in a security-focused SDK repository.

March 2026: Focused on memory safety and input validation across two critical LedgerHQ repositories, delivering defensive fixes with accompanying unit tests to harden allocator paths and UI asset handling. No user-facing features released this month; changes are aimed at reducing security risk and increasing stability in core SDK and Ethereum app.

February 2026 monthly summary for LedgerHQ/app-ethereum: Delivered major enhancements to the internal Ethereum plugin testing workflow and hardened fuzzing resilience. Key outcomes include expanded testing harness coverage for Ethereum plugins spanning EIP-7002, EIP-7251, ERC-20/721/1155, ETH2, and swap functionalities, accompanied by targeted fuzzing robustness fixes. These changes improved test reliability, reduced deployment risk, and accelerated feedback loops for plugin development.

Month: 2026-01 — LedgerHQ/ledger-secure-sdk: Delivered robust error handling and improved reporting across core subsystems, with a focus on install parameter generation and Makefile-driven workflows. Key changes include enhanced BIP32 path parsing error handling for reserved wildcard values and clearer, actionable error reporting for install parameters, including failures from Makefile and Python scripts. These changes reduce triage time, increase reliability of the installation path, and improve observability. Technologies/skills demonstrated include error handling patterns, parsing logic, cross-script orchestration, and observability enhancements. Commits: a2051d49abffa52dc1bf088c6f63d6f57103a51d; 2b72734204663eecce92e306229a6b625d3cce37.

December 2025: Delivered Memory Allocation Fuzzing Enhancement with Realloc Support for the ledger-secure-sdk fuzzing harness. Expanded inputs to exercise realloc operations, increasing memory-management test coverage and robustness. Commit e76cf80a2d3b84d1e28ec924dfd3aa5a2f8a977e.

September 2025 (LedgerHQ/app-ethereum): Delivered Fuzz Testing Enhancements with EIP712 Signing. Expanded fuzzing to cover EIP712 message signing, introduced new harness functions for better coverage and error handling, and applied targeted improvements to fuzzing workflows. These changes strengthen security verification for Ethereum signing paths and reduce triage time for edge-case failures.

June 2025 monthly summary for LedgerHQ/ledger-secure-sdk focusing on stability hardening in BLE APDU handling and USB interface management. Implemented critical safety guards and bounds checks to prevent crashes and out-of-bounds writes, contributing to reliability and maintainability.

April 2025 monthly summary for LedgerHQ/app-ethereum focused on strengthening fuzz testing infrastructure and expanding coverage for Ethereum authorization flows. Key improvements include a fuzzing harness refactor to align function names with updated signatures, and remediation of false positives through correct memory and calldata initialization during fuzz testing. Introduced EIP-7702 fuzzing support to validate authorization-related behavior in Ethereum transactions, with updates to the fuzz harness and new EIP-7702 logic. These efforts enhance testing reliability, reduce noise, and expand security validation across critical transaction paths.

March 2025 — LedgerHQ/app-ethereum: Implemented fuzz testing enhancements for transaction simulation and proxy information handling, extending the fuzzing window from 5 to 15 minutes to boost coverage and robustness. Updated CI workflow to support new fuzz features and longer cron fuzz jobs. No additional feature work beyond the fuzzing enhancements this month. Commits included: 266d0a7ecb81290914821e82c99739577bf167c9 (test: fuzz 1.16.0 new features) and 25a16eeaa600087630081a18af9e527f20f78d49 (ci: increase the cron fuzz job duration). Overall impact: improved test coverage for critical transaction paths, reduced risk in production deploys, and enhanced maintainability of the fuzzing framework. Technologies/skills demonstrated: fuzz testing, test automation, CI/CD workflow updates, and feature-based test design.

January 2025 performance summary for LedgerHQ/app-ethereum: Key feature delivered memory clearing hardening in fuzzing mocks by replacing explicit_bzero with memset_s, standardizing memory clearing across the codebase. This involved two commits removing the explicit_bzero macro in fuzzing mocks. No major bugs fixed this month. Impact: improved security of fuzzing paths, reduced risk of data remnants, and improved maintainability. Skills demonstrated: secure memory handling in C, macro refactoring, fuzzing tooling, codebase standardization.

December 2024 monthly summary for LedgerHQ/app-ethereum focusing on fuzz testing framework improvements, reliability fixes, and security posture. Delivered integrated fuzzing infrastructure with new fuzzers, a unified build process, and automation scripts for fuzz testing and coverage, enabling memory and address sanitizer support for local testing. Fixed critical uninitialized-variable issues in transaction parsing and trusted name handling, improving reliability and correctness. These efforts reduce security risk, shorten time-to-detection of defects, and demonstrate strong skills in fuzzing, build systems, and code quality practices.