Expect, a core assertion library widely used within the Jest testing framework and also independently, saw a minor version increment from 21.2.0 to 21.2.1. While seemingly small, this patch release includes several dependency updates that are crucial for developers relying on consistent and accurate testing.
The most notable changes lie within the dependencies. Version 21.2.1 updates jest-diff, jest-message-util, and jest-matcher-utils dependencies to version 21.2.1 from 21.2.0. These updates often contain bug fixes, performance improvements, and refinements to error messages, leading to a smoother debugging experience. Specifically, improvements to jest-diff will positively impact the readability of diffs in failed assertions, making it easier to identify the source of discrepancies. Updated jest-message-util likely contributes to more informative assertion failure messages, clarifying the reason behind test failures. Finally, jest-matcher-utils updates bring improvements to the utilities used in custom matchers.
While the core API of Expect likely remains the same, the internal improvements brought about by these dependency updates make version 21.2.1 a recommended upgrade for developers seeking the most stable and reliable assertion experience. Users should update their installed version to benefit from enhanced accuracy, clarity, and efficiency in their testing workflows.
All the vulnerabilities related to the version 21.2.1 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.
