Regular Expression Denial of Service (ReDoS)

Overview org.webjars:showdown is a JavaScript Markdown to HTML converter. Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS in the anchors subparser in anchors.js AKA links.js. PoC time node -e '/?:^|^\ ??:\n ?.?/g.test"".repeat9999' Details Denial...