SB20261106106 - Multiple vulnerabilities in Fastify

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Main Vulnerability Database SB20261106106

SB20261106106 - Multiple vulnerabilities in Fastify

Published: November 6, 2026

Security Bulletin ID SB20261106106
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Uncaught Exception (CVE-ID: CVE-2026-120216)

CWE-ID: CWE-248 - Uncaught Exception

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows an unauthenticated remote attacker to crash a Fastify server and interrupt other in-flight requests.

The vulnerability exists due to an uncaught exception in Fastify when a nonzero handlerTimeout expires after a streaming response has sent its headers. An unauthenticated remote attacker can send a single request to an affected streaming endpoint whose response remains open past the timeout, causing the Node.js process to terminate.


Remediation

Install update from vendor's website.

References