Expect, a crucial assertion library within the Jest testing framework, saw a minor version update from 22.4.0 to 22.4.3. While seemingly small, these increments often bundle important bug fixes and dependency updates that enhance stability and developer experience. Diving into the differences reveals that version 22.4.3 depends on newer versions of several internal Jest utilities: jest-diff, jest-get-type, jest-regex-util, jest-message-util, and jest-matcher-utils, all bumped to version 22.4.3 (except ansi-styles that remained on the same version).
These updated dependencies likely include refinements to diffing algorithms for clearer error messages, improved type detection for more accurate assertions, and enhancements to the overall matcher utility framework. Developers utilizing these modules directly within their tests or custom matchers would benefit from the improved robustness and potentially new features within these updated internal packages. Although the core expect API remains consistent, the internal changes contribute to a more reliable and informative testing process. The unpacked size also slightly decreased (535270 to 528333) indicating that code optimization could have been performed. Therefore, upgrading to version 22.4.3 is recommended for developers seeking the latest bug fixes and enhancements within the Expect library.
All the vulnerabilities related to the version 22.4.3 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.
