Expect versions 23.0.1 and 23.0.0 are both iterations of the assertion library integral to Jest, the popular JavaScript testing framework. Primarily, expect provides the expect function, empowering developers to write expressive and readable tests by asserting conditions about their code. While both versions share the same core functionality and description, focusing on improved testing experiences, subtle differences in their dependencies and release specifics warrant attention.
Version 23.0.1, released shortly after 23.0.0, includes updated versions of several internal dependencies. Notably, jest-diff and jest-matcher-utils are bumped from ^23.0.0 to ^23.0.1. These updates likely contained bug fixes, performance improvements, or minor feature enhancements within the diffing and matcher utilities. Developers leveraging expect directly, or indirectly through Jest, benefit from these underlying improvements, potentially leading to more accurate and efficient test executions. The unpacked size also increased slightly, from 569152 to 569321, suggesting minor additions or adjustments to the codebase. The release date is also different, 2018-05-27T15:31:26.128Z for 23.0.1 and 2018-05-24T17:26:54.305Z for the previous version.
Considering both versions, developers gain a robust assertion tool designed for clarity and ease of use. The expect function, thoroughly documented on Jest's website, enables a wide array of matchers for diverse testing scenarios. While the differences between versions 23.0.0 and 23.0.1 may seem minor, they showcase the ongoing refinement and maintenance expected in a well-supported library.
All the vulnerabilities related to the version 23.0.1 of the package
Regular Expression Denial of Service (ReDoS) in micromatch
The NPM package micromatch prior to version 4.0.8 is vulnerable to Regular Expression Denial of Service (ReDoS). The vulnerability occurs in micromatch.braces() in index.js because the pattern .* will greedily match anything. By passing a malicious payload, the pattern matching will keep backtracking to the input while it doesn't find the closing bracket. As the input size increases, the consumption time will also increase until it causes the application to hang or slow down. There was a merged fix but further testing shows the issue persisted prior to https://github.com/micromatch/micromatch/pull/266. This issue should be mitigated by using a safe pattern that won't start backtracking the regular expression due to greedy matching.
Regular Expression Denial of Service (ReDoS) in braces
A vulnerability was found in Braces versions prior to 2.3.1. Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS) attacks.
Regular Expression Denial of Service in braces
Versions of braces prior to 2.3.1 are vulnerable to Regular Expression Denial of Service (ReDoS). Untrusted input may cause catastrophic backtracking while matching regular expressions. This can cause the application to be unresponsive leading to Denial of Service.
Upgrade to version 2.3.1 or higher.
Uncontrolled resource consumption in braces
The NPM package braces fails to limit the number of characters it can handle, which could lead to Memory Exhaustion. In lib/parse.js, if a malicious user sends "imbalanced braces" as input, the parsing will enter a loop, which will cause the program to start allocating heap memory without freeing it at any moment of the loop. Eventually, the JavaScript heap limit is reached, and the program will crash.
