Expect, a crucial component of the Jest testing framework, provides the expect function used extensively for writing assertions in JavaScript tests. Comparing versions 23.2.0 and 23.1.0 reveals subtle but important updates for developers. Both versions share the same core purpose: offering a reliable way to make assertions about expected outcomes within Jest tests, aligning with Jest's documentation and overall testing philosophy.
The key differences are in the dependency updates. Version 23.2.0 upgrades to jest-diff":"^23.2.0, jest-message-util":"^23.2.0, and jest-matcher-utils":"^23.2.0. This suggests improvements or bug fixes within Jest's internal utility functions related to comparing differences, constructing user-friendly messages, and handling matcher utilities. Version 23.1.0 instead depends on jest-diff":"^23.0.1, jest-message-util":"^23.1.0" and jest-matcher-utils":"^23.0.1". Developers should consider upgrading to 23.2.0, particularly if they encountered issues related to diffing or error messages in their tests, as these updates likely address those concerns. Furthermore, the unpacked size of 23.2.0 significantly increases to 1100455 compared to 23.1.0's 569459 potentially indicating added features or more comprehensive data within the utility packages. Finally, the release date indicates a nearly month-long gap between the two versions, suggesting that 23.2.0 incorporates accumulated refinements and potential community-reported fixes since 23.1.0.
All the vulnerabilities related to the version 23.2.0 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.
