React2Shell RCE in React Server Components

News for the week of December 1, 2025: Anthrophic acquired Bun, React2Shell is pretty darn bad (and that's not all), plus "elf spam" packages on npm. From the community: tRPC vs. oRPC, demystifying TSConfig, and hash-slash (#/) project-relative import support in Node.

MCP in Practice Course
Watch now. Kamran shows you how to build a practical enterprise-grade MCP server with .NET, C#, and OAuth, hosted remotely on Azure. (Requires subscription)

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• Homepage and Docs: https://excaliburjs.com
• Make Your First Game in 10 Minutes
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Chapters

• (00:00) - Welcome to the Show
• (04:09) - Kamran's MCP in Practice Course is Now Live on Pluralsight
• (08:35) - News: Anthropic Acquires the Bun JavaScript Runtime
• (13:41) - News: Vite 8 Beta with Rolldown
• (15:40) - News: tsdown 0.17 Release
• (17:10) - News: oxlint Brings Type-aware Linting in Alpha
• (17:50) - News: oxfmt Alpha is 30X Faster Than Prettier
• (18:45) - News: Gird Your Loins for Upcoming Node.js Security Releases
• (19:38) - News: React2Shell Remote Code Execution Exploit in RSC
• (26:55) - News: React2Shell Causes Yet Another Cloudflare Outage
• (28:16) - News: Santa's Elves Flood npm With Naughty "Gifts"
• (30:10) - News: SVG Clickjacking Exploit Using Filters
• (32:05) - Community Highlight: tRPC vs. oRPC for Your Next TypeScript Project?
• (33:15) - Community Highlight: Testing Vue Composables in TypeScript by John Franey
• (34:03) - Community Highlight: Formisch for React Quietly Released by Fabian Hillar
• (34:53) - Community Highlight: Building a Dinosaur Runner Game in Deno
• (36:19) - Community Highlight: Node Will Soon Support Project Root Import Paths
• (37:51) - Community Highlight: TSConfig Grimoire by Bjorn Lu
• (39:01) - Community Highlight: How is ESM vs. CJS Going? by Titus
• (40:45) - Community Highlight: Next Astro Release Supports Vite Environments API
• (41:18) - Bleet of the Week by Joke Bailey
• (42:10) - Cool Read: Godot Shaders Bible by Fabrizio Espendola
• (42:56) - Cool Watch: Cancellation Tokens by Stephen Toub
• (43:44) - Cool Game: Classic Game Zork is Released as Open Source
• (44:16) - Cool Tool: Helion, a Modern DOOM Engine
• (45:18) - Cool Watch: Modern .NET Serialization Attacks by Hampton Paulk
• (47:25) - Cool Reads: Architecture for Flow and Domain-driven Transformation
• (48:40) - The Minnesota Long Goodbye

News

• Bun: Bun is joining Anthropic 
• ViteLand: Vite 8 Beta: The Rolldown-powered Vite
• ViteLand: Announcing Oxlint Type-Aware Linting Alpha
• ViteLand: The first Oxfmt alpha was released
• ViteLand: tsdown got a new release
• Node.js PSA: Prepare for Monday, December 15, 2025 Security Releases
• Cloudflare: Cloudflare outage on December 5, 2025
• Security: npm Sees Surge of Auto-Generated “elf-stats” Packages Published Every Two Minutes via (Sarah Gooding)
• Security: SVG Filters - Clickjacking 2.0 Ʊ lyra's epic blog 

React2Shell Resources

• React2Shell Exploit: Critical Security Vulnerability in React Server Components
• Deep Dive: https://react2shell.com/
• Next.js: Security Advisory: CVE-2025-66478
• Deno Blog: React Server Functions / Next.js Vulnerability: Deno Deploy users protected 
• Explainer: this is the worst case scenario by LowLevelEd

From the Community

• Temitope Oyedele: tRPC vs oRPC: Which is better for your next TypeScript project, and why?
• John Franey: How to test a Vue composable with TypeScript · JohnFraney.ca
• Fabian Hiller: Formisch for React just released (quietly) – the form library that powers SolidJS 
• Deno: Build a browser game in Deno 
• Hybrist: Node support for #/ wildcard (via Rob Palmer)
• Bjorn Lu: TSConfig Grimoire (via Rob Palmer)
• Wooorm: How is ESM from Common going?
• Astro: Next release of Astro will support Vite Environment API

Cool Links

• Cool Read: Godot Shaders Bible and Ghastly in Desmos by Fabrizio Espindola
• Cool Watch: Cancellation Tokens with Stephen Toub
• Cool Game: Preserving code that shaped generations: Zork I, II, and III go Open Source 
• Cool Tool: Helion Engine, a modern DOOM engine in C#
• Cool Watch: Modern .NET Serialization Attacks by Hampton Paulk
• Cool Reads: Architecture for Flow and Domain-driven Transformation

Music
Seahorse Dreams by Kubbi (Spotify)