es5-ext contains ECMAScript 5 extensions. Passing functions with very long names or complex default argument names into function#copy or function#toStringTokens may cause the script to stall. The vulnerability is patched in v0.10.63.
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
Attackers can create crafted inputs that
intentionally cause the regular expression to use
excessive backtracking in a way that causes the CPU
consumption to spike.