Acorn version 6.0.5 represents a minor update to the popular ECMAScript parser, building upon the foundation established in version 6.0.4. While both versions share the same core functionality, license (MIT), and repository, a closer look reveals subtle yet potentially impactful changes. Developers will note the increase in unpacked size, albeit marginal (1084980 bytes vs 1084020 bytes), suggesting refined code or expanded functionality within the parser. The most obvious point to consider is the release date difference; version 6.0.5 arrived approximately two months after 6.0.4 (January 2nd, 2019, compared to November 5th, 2018). This time difference indicates that 6.0.5 likely incorporates bug fixes, performance improvements, or minor feature additions identified and implemented during that period.
For developers already using Acorn, upgrading to 6.0.5 is generally recommended to leverage these potential enhancements and ensure they are working with the most up-to-date and stable version. If experiencing specific parsing issues with 6.0.4, the newer version is especially worth investigating, as it might contain a resolution. For new users, starting directly with 6.0.5 offers the best experience, providing a reliable and efficient ECMAScript parsing solution. Acorn continues to be a solid choice for projects that require robust and standards-compliant JavaScript parsing capabilities.
All the vulnerabilities related to the version 6.0.5 of the package
Regular Expression Denial of Service in Acorn
Affected versions of acorn are vulnerable to Regular Expression Denial of Service. A regex in the form of /[x-\ud800]/u causes the parser to enter an infinite loop. The string is not valid UTF16 which usually results in it being sanitized before reaching the parser. If an application processes untrusted input and passes it directly to acorn, attackers may leverage the vulnerability leading to Denial of Service.
