Top 5 tips for C++ security
Blog post from Snyk
C++ is widely used in system programming, embedded development, desktop and server applications, gaming, virtual reality, IoT firmware, and language runtimes, but its close interaction with memory and operating systems requires careful security practices. Key recommendations include validating and sanitizing all user input, correctly clearing failed input streams, checking input lengths, formats, types, and ranges, and preventing arithmetic overflow or underflow through explicit boundary checks and compiler sanitizers. Developers should avoid unsafe string functions such as `strcpy()` and `strcat()`, securely manage file streams to reduce path traversal and file-handling risks, and limit use of `system()` and other process-execution functions because they can enable command injection or expose sensitive operating-system functionality. The material also emphasizes scanning dependencies and project libraries with static code analysis tools, using Snyk’s CLI as an example for identifying known vulnerabilities in unmanaged C++ projects, and argues that incorporating security throughout development helps protect applications, users, and their data.
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