CWE-168 (不一致特殊元素净化处理不恰当) — Vulnerability Class 2

CWE-168 represents a structural input validation weakness where software fails to correctly process inconsistencies between paired special characters or reserved words. This flaw typically manifests when delimiters, such as quotes or tags, appear in the wrong order or are improperly nested, leading to parsing errors or unexpected behavior. Attackers exploit this by crafting malformed inputs that break the expected syntactic structure, potentially causing denial of service, data corruption, or bypassing security controls that rely on strict format adherence. To mitigate this risk, developers must implement robust parsing logic that strictly validates the order and nesting of all special elements before processing. Utilizing standardized libraries for parsing complex formats and enforcing rigorous input sanitization ensures that inconsistent structures are rejected early, maintaining application integrity and preventing exploitation of these structural ambiguities.