Denial of Service vulnerability via local manipulation of compiler functions

Summary

A vulnerability has been found in connorskees grass up to 0.13.4. The impacted element is the function grass_compiler::selector::extend/grass_compiler::evaluate::visitor. The manipulation leads to denial of service. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. The project maintainer explains: "DoS vulnerabilities are generally fine in Sass compilers -- they are trivially possible with recursive functions, infinite loops, nested mixins, etc. The description here is wrong. Compile time is not expected to be linear relative to the input, and the @extend algorithm is definitionally exponential." A flaw was found in grass, a Sass compiler. This can lead to the compiler becoming unresponsive or crashing, impacting the availability of the service. While a DoS is possible through manipulating compiler functions, such as `grass_compiler::selector::extend` or `grass_compiler::evaluate::visitor`, this typically affects build or development environments where local access is already assumed, limiting its broader impact on Red Hat products. Red Hat severity: Low — CVSS 3.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-835.