Svelte version 3.29.7 is a minor version update to the popular JavaScript compiler that transforms component code into highly efficient vanilla JavaScript. Released shortly after version 3.29.6, this patch likely includes bug fixes and minor improvements over its predecessor. Both versions share the same core development dependencies, indicating a consistent development environment and toolchain. Developers can expect a smooth transition when upgrading.
The two versions share the same description "Cybernetically enhanced web apps", which speaks to Svelte's ability to produce performant and optimized code, leading to faster load times and improved user experiences. The list of development dependencies that includes tools like Rollup, TypeScript, eslint, and others, confirms Svelte's modern development practices and focus on code quality.
While a detailed changelog would be needed to pinpoint exact changes, the updated release date and slightly increased unpacked size (6001546 vs 6001378) of the newer version strongly suggest that 3.29.7 addresses specific issues identified in 3.29.6. These kind of patch versions usually include bugfixes and minor performance upgrades. Users of Svelte are encouraged to update to the latest patch version to benefit from these improvements and ensure a stable development experience. Svelte remains a compelling choice for developers seeking a performant and streamlined approach to building web applications, offering a concise syntax and reactive updates with minimal overhead.
All the vulnerabilities related to the version 3.29.7 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