Expect, a core component of the Jest testing framework, provides the expect function for writing expressive and readable tests. Version 23.5.0 builds upon the previous stable version, 23.4.0, with key dependency updates that subtly enhance the testing experience. The most notable change lies in the updated dependencies, with "jest-diff" moving from version ^23.2.0 in 23.4.0 to ^23.5.0 in the newer release and "jest-matcher-utils" upgrading from ^23.2.0 to ^23.5.0. These dependency updates often involve bug fixes, performance improvements, and potentially new features within the related modules. "jest-diff" is crucial for generating informative diffs in case of test failures which are easier to use by the developer using the tool. Similarly, "jest-matcher-utils" provides utilities for creating custom matchers, that allows for additional flexibility. While the core functionality of expect remains consistent, these internal improvements provide benefits in terms of reliability. The fileCount changed from 17 to 13 in the new version and the unpackedSize suffered a small change, but nothing to worry about. Developers upgrading from 23.4.0 to 23.5.0 can expect a smoother and more reliable testing experience.
All the vulnerabilities related to the version 23.5.0 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.
