Advisory Weakness Curation

Regular Expression Denial of Service in negotiator Affected versions of `negotiator` are vulnerable to regular expression denial of service attacks, which trigger upon parsing a specially crafted `Accept-Language` header value. ## Recommendation Update to version 0.6.1 or later.

Improper Input Validation negotiator is an HTTP content negotiator for Node.js and is used by many modules and frameworks including Express and Koa. The header for "Accept-Language", when parsed by negotiator 0.6.0 and earlier is vulnerable to Regular Expression Denial of Service via a specially crafted string.