Svelte version 3.16.1 is a patch release following closely on the heels of version 3.16.0, both iterations focusing on delivering a cybernetically enhanced approach to web application development. Developers leveraging Svelte benefit from its compiler-first architecture, resulting in highly optimized and performant JavaScript code. The core description remains consistent: "Cybernetically enhanced web apps," emphasizing Svelte's unique approach to front-end development where the framework shifts much of the workload to the compile step, producing lean and efficient output.
Examining the differences, the core functionalities and developer experience are largely unchanged between the two versions. Both rely on a robust set of devDependencies for testing, linting, and build processes, ensuring code quality and maintainability. These include tools like Rollup for bundling, ESLint for code style enforcement, and TypeScript for enhanced JavaScript development. While the dependencies remain the same, the crucial difference lies in the dist section. Version 3.16.1 brings a slight adjustment, containing 205 files within the packaged archive, marginally decreased from 3.16.0 which had 207 files. Correspondingly, there's also a marginal increment in the unpackedSize going from 3028091 to 3028979 for the newer version. These subtle changes generally arise from bug fixes, documentation updates, or minor optimisations. The patch release was published approximately nine days after the previous version, suggesting a quick resolution to an identified issue. Developers can therefore expect a polished experience with potential minor bug fixes in 3.16.1, making it a preferable choice for new projects. The rapid release cycle demonstrates the Svelte team's dedication to stability and continuous improvement.
All the vulnerabilities related to the version 3.16.1 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