markdown-it@2.1.2 vulnerabilities

markdown-it is a modern pluggable markdown parser.

Affected versions of this package are vulnerable to Infinite loop in linkify inline rule when using malformed input.

Upgrade markdown-it to version 13.0.2 or higher.

markdown-it is a modern pluggable markdown parser.

Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS) in the cdata pattern in common/html_re.js.

Upgrade markdown-it to version 3.0.0 or higher.

markdown-it is a modern pluggable markdown parser.

Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS) via the /s+$/ in line 23 of lib/rules_inline/newline.js. This expression is used to remove trailing whitespaces from a string, however, it also matches non-trailing whitespaces. In the worst-case scenario, the matching process would take computation time proportional to the square of the length of the non-trailing whitespaces. It is possible that a string containing more than tens of thousands characters, as markdown-it handles Markdown, would be passed over the network, resulting in significant computational time.

Upgrade markdown-it to version 12.3.2 or higher.

markdown-it is a modern pluggable markdown parser.

Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS). Parsing __*_… takes quadratic time, this could be a denial of service vulnerability in an application that parses user input.

Upgrade markdown-it to version 10.0.0 or higher.

markdown-it is a pluggable markdown parser used for rendering markdown content to html.

Affected versions of the package allowed the use of data: URIs for all mime types by default potentially opening a door for Cross-site Scripting (XSS) attacks.

The fix was introduced in version 4.1.0, whitelisting the following four data types image/gif, image/png, image/jpeg and image/webp while blocking the others by default.

Data URIs enable embedding small files in line in HTML documents, provided in the URL itself. Attackers can craft malicious web pages containing either HTML or script code that utilizes the data URI scheme, allowing them to bypass access controls or steal sensitive information.

An example of data URI used to deliver javascript code. The data holds <script>alert('XSS')</script> tag in base64 encoded format.

[xss link](data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4K)

Upgrade to markdown-it version 4.1.0 or newer.