CVE-2024-34075 – kurwov vulnerable to Denial of Service due to improper data sanitization

https://notcve.org/view.php?id=CVE-2024-34075

kurwov is a fast, dependency-free library for creating Markov Chains. An unsafe sanitization of dataset contents on the `MarkovData#getNext` method used in `Markov#generate` and `Markov#choose` allows a maliciously crafted string on the dataset to throw and stop the function from running properly. If a string contains a forbidden substring (i.e. `__proto__`) followed by a space character, the code will access a special property in `MarkovData#finalData` by removing the last character of the string, bypassing the dataset sanitization (as it is supposed to be already sanitized before this function is called). Any dataset can be contaminated with the substring making it unable to properly generate anything in some cases. • https://github.com/xiboon/kurwov/blob/0d58dfa42135ab40e830e92622857282f980ca89/src/MarkovData.ts#L38-L44 https://github.com/xiboon/kurwov/commit/85d63e652594f121d6656177d7a3c0d823c976c9 https://github.com/xiboon/kurwov/security/advisories/GHSA-hfrv-h3q8-9jpr • CWE-502: Deserialization of Untrusted Data •