Svelte 2.4.1 is a minor patch release of the Svelte JavaScript framework, a tool known for its "disappearing" nature, meaning it shifts the work of a typical UI framework from the browser to compile time. This results in highly optimized, lightweight web applications. Compared to its predecessor, version 2.4.0, the changes are incremental but potentially important for stability.
Both versions share the same core development dependencies, indicating no significant shifts in the underlying build process or testing methodologies. These dependencies include tools for bundling (Rollup), linting (ESLint), testing (Mocha, JSDOM), and TypeScript support, confirming a robust development environment. The size difference in unpackedSize between the two versions (2551411 vs 2551199 bytes) suggests a small adjustment in the compiled output, likely related to bug fixes or minor performance tweaks.
For developers using Svelte, the update from 2.4.0 to 2.4.1 would likely be a seamless experience. Since it's a patch release, the primary expectation would be improved stability and the resolution of any edge-case bugs present in the previous version without any breaking changes introduced. Always consult the changelog for detailed list to completely understand the updates. Given Svelte's focus on performance, even small updates like this can contribute to a better user experience. The releaseDate confirms the versions being very close to each other, suggesting a quick release to address a problem found after the first one.
All the vulnerabilities related to the version 2.4.1 of the package
Svelte vulnerable to XSS when using objects during server-side rendering
The package svelte before 3.49.0 is vulnerable to Cross-site Scripting (XSS) due to improper input sanitization and to improper escape of attributes when using objects during SSR (Server-Side Rendering). Exploiting this vulnerability is possible via objects with a custom toString() function.
Svelte has a potential mXSS vulnerability due to improper HTML escaping
A potential XSS vulnerability exists in Svelte for versions prior to 4.2.19.
Svelte improperly escapes HTML on server-side rendering. It converts strings according to the following rules:
" -> "& -> &< -> <& -> &The assumption is that attributes will always stay as such, but in some situation the final DOM tree rendered on browsers is different from what Svelte expects on server-side rendering. This may be leveraged to perform XSS attacks. More specifically, this can occur when injecting malicious content into an attribute within a <noscript> tag.
A vulnerable page (+page.svelte):
<script>
import { page } from "$app/stores"
// user input
let href = $page.url.searchParams.get("href") ?? "https://example.com";
</script>
<noscript>
<a href={href}>test</a>
</noscript>
If a user accesses the following URL,
http://localhost:4173/?href=</noscript><script>alert(123)</script>
then, alert(123) will be executed.
XSS, when using an attribute within a noscript tag