Svelte 2.6.5 represents a minor update over version 2.6.4 in the Svelte framework, a popular choice for building performant web applications with its unique compile-to-optimized-JavaScript approach. Both versions share the same fundamental characteristics: a "magical disappearing UI framework" designed to shift the workload from the browser to the build process, resulting in faster load times and improved runtime performance.
Examining the package details reveals that the core development dependencies remain consistent between these two releases. These dependencies encompass a comprehensive toolchain, including testing frameworks like Mocha and NYC, bundlers like Rollup, linters like ESLint, and preprocessors like Typescript, ensuring a robust development experience. Build tools include acorn, sade, and sander.
The key differentiation likely lies in bug fixes and subtle internal enhancements. While the devDependencies remain identical, the unpackedSize differs slightly, with 2.6.5 at 2593490 compared to 2.6.4 at 2593342, hinting at minor changes in the compiled output. Developers upgrading from 2.6.4 to 2.6.5 can anticipate a seamless transition, as this patch version is intended to provide stability and refinement without introducing breaking changes or new features. The release date difference suggests quick iteration to address issues. For new users, either version remains a solid starting point for exploring Svelte's component-based architecture and reactive programming model. Always check the Svelte changelog for detailed patch notes.
All the vulnerabilities related to the version 2.6.5 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