Software Eng @Auth0 | Tinkering with Node.js core, Undici, Fastify & Piscinajs | Dealing with HTTP clients, worker threads, and occasionally speaking about it

Amsterdam, Holanda
Joined July 2010
Carlos Fuentes retweeted
So basically, today PHP got two critical bugs that let anyone run code on your server without even logging in, which is bad, and then the details leaked before the patch was even out, which is worse, and it works on WordPress and MediaWiki and Magento and Joomla and Laravel, and Censys says like 1.5 million servers are running a version with no fix, so the NSA was like "take your system offline," and the FBI was like "take your system offline," and CISA and the UK and CERT-EU were all like "take your system offline," and then the Prime Minister of Japan, the actual Prime Minister, posted at 5:55 in the morning telling 48.8 million people to take their system offline, so everyone took their system offline, like the Dutch cybersecurity agency took its own website offline, and the Dutch parliament went offline, and the Port of Rotterdam went offline, and Finland and France and Denmark started pulling government sites, and Wikipedia went down, and Archive.org went down, and Asana and GOG and Something Awful went down, and the University of Vienna's webmail went down for some reason, and that's just PHP. Because GitLab also dropped a CVSS 10.0, which is the highest score they give out, for a bug that's been there since 2014, so that's every self-hosted GitLab for twelve years, and then LiteLLM 1.107.0 got hijacked and shipped a credential stealer and a remote access trojan in every single wheel and the Docker images, including latest, and you didn't even have to import it, just installing it was enough, and it's the second time this year, and then Railway paused every deployment on the entire platform because someone got into the environment variables, so now everyone has to rotate every secret they've ever stored there, and TiDB Cloud said someone was walking around inside with stolen credentials for basically a month and an extortion group says they took 10.6 terabytes, and Zeabur got breached for the second time in two months and is just shutting down, like the whole company, and Node.js patched remote code execution and a TLS bypass, and CISA says Plex is being actively exploited, and someone took over 300 Tor exit relays to steal SSH passwords, and SafePay ransomware has hit over 600 critical infrastructure orgs, and India's biggest bank filed a data loss incident, and Japan has been in an official state of emergency in cyberspace since October 9, which honestly explains the 5:55 AM post. Oh, and eMudhra, a certificate authority that's issued over 60 million certificates, whose entire job is proving websites are who they say they are, was supposed to be using private keys that are random numbers over a hundred digits long, and one of them was 4. Just 4. And the others were like 66 and 237. Anyway, it's Wednesday.
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Carlos Fuentes retweeted
🔐 Node.js security updates are now available! New releases for Node.js 22.x, 24.x & 26.x address multiple vulnerabilities, including high-severity issues. Review the details and update your systems to stay secure. 🔗 nodejs.org/en/blog/vulnerabi… #NodeJS #Security
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Carlos Fuentes retweeted
Please, folks... It's not uncommon to patch "HIGH SEVERITY" vulnerabilities. These are the number of high-severity reports we fixed in the last 10 security releases
🚨 BREAKING: Node.js just dropped its OWN security bombshell. 4 HIGH-SEVERITY vulnerabilities patched TODAY, including one that could let hackers remotely execute malicious code on vulnerable servers. → 10 SECURITY FLAWS were addressed in today's Node.js release, FOUR rated HIGH severity. → REMOTE CODE EXECUTION: CVE-2026-111497 is a serious flaw in Node.js's Brotli decoder that could allow attackers to execute malicious code remotely. → TLS SECURITY BYPASS: Two separate vulnerabilities could trick affected applications into accepting certificates for the WRONG server under certain conditions. → Think about that. Your application could establish an encrypted connection while failing to properly verify WHO it's talking to. → THREE MAJOR NODE.JS VERSIONS AFFECTED: Node.js 22, 24 and 26 all required emergency security updates. → RUNNING NODE.JS 18 OR 20? Those versions are END-OF-LIFE and aren't receiving these official security patches. → PATCH IMMEDIATELY: Update to Node.js 22.23.4, 24.22.1 or 26.12.1, depending on your release line. If you're using Docker, rebuild and redeploy your containers. PHP AND Node.js both facing major security disclosures on the SAME DAY. If you run a website or application, TODAY is the day to check your servers. And remember: the public release of security patches can give attackers a roadmap to systems that haven't updated. Don't be the last one to patch.
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Will be in London this weekend for the TechLead Conf and the React Advanced! If you happened to be around and wanna have a coffee ☕️ let me know
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Carlos Fuentes retweeted
I see this less as GitHub failing and more as open source evolving. The current workflow is increasingly absurd: someone uses AI to generate a PR, I use a better AI to review it, then their AI and my AI go back and forth until we converge. Add AI-generated spam on top, and the human is mostly just acting as a router between agents. I’d rather skip that entire loop. Imagine you use a project and want a feature. You go to the repo and describe what you want. The project’s AI already knows its conventions, preferences, history, rejected ideas, and boundaries. It can immediately tell you whether the idea is likely to fit and what shape it should take. If it makes sense, you press a button and the project’s chosen AI implements it, validates it, and presents the maintainer with the request and the code as one thing. No separate issue. No PR ping-pong. No two AIs talking through two humans. What AI still canot replace is taste: deciding what a project should be, what belongs in it, and where its boundaries are.
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🚀 The full lineup for TechLead Conf is here! Join us in London on Oct 23, 2026, for a day built around adopting AI for hands-on engineering leaders. See the full schedule and grab your ticket 🎟️ techleadconf.com
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Carlos Fuentes retweeted
If you’re a serious security researcher experiencing delays in your report assessment, please be patient. Many projects are receiving up to five times more reports due to AI slop.
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What does engineering actually look like in the age of LLMs? @metcoder95 , Senior Software Engineer at Auth0 and open-source maintainer of Fastify, Undici & Piscina, goes "Beyond Rubber Ducking." Check it out at TechLead Conf.
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If you are at @devworld_conf , come to the @auth0 stand to say hi! 👋
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Carlos Fuentes retweeted
another week at the prompt factory
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Excited to be speaking at @devworld_conf 2026 in May 8th! Join me at 16:00-16:30 on Duck Stage 2 to speak about Undici, Node.js and 85 other unique sessions & deep dives at Devworld! Agenda is live now - check it out via devworldconference.com #devworld2026
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Carlos Fuentes retweeted
The axios breach is a good opportunity to review your package manager settings I recommend pnpm @pnpmjs Default: postinstall scripts are blocked, protects against axios vector Also try: - minimumReleaseAge: 10080 (pkgs must be min 7 days old) - trustPolicy - blockExoticSubdeps
Yep all our repos use pnpm-workspace.yaml, it's the standard way of configuring many security features like allowBuilds, minimumReleaseAge, trustPolicy, etc pnpm.io/settings
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Carlos Fuentes retweeted
Who knows how to secure open source better than the maintainers themselves? 🛡️ In Session 3 of the GitHub Secure Open Source Fund, 67 more projects improved their defenses. From securing the AI stack to strengthening the global supply chain, find out how these maintainers are making security improvements that benefit the entire ecosystem. 👇 github.blog/open-source/main…
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I've been thinking about this project for a while and finally found the time to materialise it! github.com/metcoder95/fuse-b… A small library with utilities to apply resiliency patterns to (almost) all kinds of workloads! Feedback is always welcome :)
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Carlos Fuentes retweeted
Scaling AI agents isn’t just about speed — it’s about state (and security). In this session, @matteocollina (Co-Founder & CTO at @Platformatic) shows how to build stateful #MCP servers using Node.js, Platformatic & Fastify — and secure them with @Auth0.
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There has been considerable discussion on how to implement Authentication using OAuth in MCP, including a lot of criticism on using Dynamic Client Registration (DCR). I've partnered with Auth0 to demonstrate how it's possible to implement this and provide a secure authentication flow for your MCP users in Node.js using @platformatic technology.
Scaling AI agents isn’t just about speed — it’s about state (and security). In this session, @matteocollina (Co-Founder & CTO at @Platformatic) shows how to build stateful #MCP servers using Node.js, Platformatic & Fastify — and secure them with @Auth0.
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Carlos Fuentes retweeted
WebSockets over http2 just landed in undici thanks to @metcoder95!
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We're excited to welcome @LambdaTest as a new Bronze Sponsor of Piscina.js! 🙌 It directly helps fund the ongoing maintenance and future development of the project. Thank you!  Learn more about our sponsors: piscinajs.dev
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