Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

• Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
• Code is considered more complex for each "break in the linear flow of the code"
• Code is considered more complex when "flow breaking structures are nested"

Further reading

• Cognitive Complexity docs
• Cognitive Complexity: A new way of measuring understandability

Regular Expression Denial of Service

Overview:

The tough-cookie module is vulnerable to regular expression denial of service. Input of around 50k characters is required for a slow down of around 2 seconds.

Unless node was compiled using the -DHTTPMAXHEADER_SIZE= option the default header max length is 80kb so the impact of the ReDoS is limited to around 7.3 seconds of blocking.

At the time of writing all version <=2.3.2 are vulnerable

Recommendation:

Please update to version 2.3.3 or greater

Regular Expression Denial of Service

Overview:

The marked module is vulnerable to a regular expression denial of service. Based on the information published in the public issue, 1k characters can block for around 6 seconds.

Recommendation:

Consider another markdown parser until the issue can be addressed.

Regular Expression Denial of Service

Overview:

The debug module is vulnerable to regular expression denial of service when untrusted user input is passed into the o formatter. It takes around 50k characters to block for 2 seconds making this a low severity issue.

Recommendation:

Upgrade to version 2.6.9 or greater if you are on the 2.6.x series or 3.1.0 or greater.