Integer Overflow

Integer overflow is a programming error that occurs when an arithmetic operation attempts to create a numeric value that is outside the range that can be represented with a given number of bits. This can lead to unexpected behavior, such as wrapping around to a small or negative value, or causing undefined behavior in some languages. It is a common source of bugs and security vulnerabilities, particularly in low-level systems programming.

Also known as: int overflow, integer wrap-around, arithmetic overflow, numeric overflow, overflow bug

Why learn Integer Overflow?

Developers should understand integer overflow to write safe and correct code, especially in performance-critical or security-sensitive applications like embedded systems, financial software, or operating systems. Learning about it helps prevent bugs that can cause crashes, incorrect calculations, or exploitable vulnerabilities such as buffer overflows. It is essential when working with languages like C, C++, or Rust where manual memory and type management is required.

Learning Resources

• docs: OWASP Integer Overflow
• docs: CWE-190: Integer Overflow or Wraparound
• video: Integer Overflow Explained - Computerphile
• course: Secure Coding in C and C++ - Integer Security
• tutorial: Rust by Example - Overflow