Meaning of billion laughs | Babel Free

Definitions

A type of denial-of-service attack which is aimed at parsers of XML documents, based on defining entities that expand to large numbers of copies of other entities.

plural, plural-only

Examples

“The XML billion laughs DoS attack simply starts by declaring an XML document with an entity named lol (hence the name laugh gets associated with it, but in a general case it can be any valid name).”

CEFR level