CWE-462 (在关联列表中具有重复Key) — Vulnerability Class 1

CWE-462 represents a data structure weakness where an associative list contains multiple entries with identical keys, creating ambiguity in value retrieval. This flaw typically arises from programming errors rather than malicious exploitation, as attackers rarely target this specific structural issue directly. However, the presence of duplicate keys can lead to unpredictable behavior, such as returning the first or last inserted value, which may cause logic errors or security bypasses if the application assumes key uniqueness. To prevent this, developers should enforce strict validation mechanisms that reject duplicate key insertions during runtime. Utilizing robust data structures like hash maps with unique constraints or implementing explicit error handling for key collisions ensures data integrity and eliminates the ambiguity inherent in flawed associative list implementations.