The package css-what before 2.1.3 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the usage of insecure regular expression in the re_attr variable of index.js. The exploitation of this vulnerability could be triggered via the parse function.
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Css-what | Css-what_project | * | 2.1.3 (excluding) |
| Node-css-what | Ubuntu | bionic | * |
| Node-css-what | Ubuntu | esm-apps/focal | * |
| Node-css-what | Ubuntu | esm-apps/xenial | * |
| Node-css-what | Ubuntu | focal | * |
| Node-css-what | Ubuntu | mantic | * |
| Node-css-what | Ubuntu | trusty | * |
| Node-css-what | Ubuntu | xenial | * |
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.