Mmastodon TechnologyCybersecurity first seen 4 h ago, last 4 h ago, peak #6

Fastify vulnerability allows authentication bypass via malformed URLs

Original: 🚨 EUVD-2026-70988 📊 Score: 7.5/10 (CVSS v3.1) 📦 Product: fastify 🏢 Vendor: fastify 📅 Updated: 2026-09-30 📝 fastify vulne

A newly catalogued vulnerability, EUVD-2026-70988, affects the Fastify web framework, rated 7.5 out of 10 on the CVSS v3.1 scale. The flaw allows authentication bypass when malformed URLs reach encapsulated not-found handlers, meaning requests intended to be blocked could slip through route protections. Fastify is a widely used Node.js framework, so developers running exposed services are being urged to review the advisory and update to a patched version.

Why now: Security teams are sharing the advisory because Fastify is widely deployed and an authentication bypass poses direct risk to web applications.

FastifyENISANode.js

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Evidence

• 🚨 EUVD-2026-70988 📊 Score: 7.5/10 (CVSS v3.1) 📦 Product: fastify 🏢 Vendor: fastify 📅 Updated: 2026-09-30 📝 fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers 🔗 https:// euvd.enisa.europa.eu/vulnerabi lity/EUVD-2026-70988 #… · EUVD_Bot

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