Description
fastify versions >= 4.0.0 and before 5.12.2 can route a malformed URL sent under one plugin prefix to the custom not-found handler of a different sibling plugin, and invoke it without the preHandler hook declared for that handler. The internal not-found router for encapsulated handlers dispatches malformed paths through a single shared handler pointer before URL decoding, ignoring the prefix and skipping the selected handler's normal lifecycle. An unauthenticated attacker can therefore reach an authentication-protected private fallback through an unrelated public prefix and read its full response, bypassing the authentication hook and breaking prefix encapsulation. Users should upgrade to fastify 5.12.2 or later.
Published: 2026-09-04
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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History

Fri, 04 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 04 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-289
References
Metrics threat_severity

None

threat_severity

Important


Fri, 04 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Fastify
Fastify fastify
Vendors & Products Fastify
Fastify fastify

Fri, 04 Sep 2026 10:00:00 +0000

Type Values Removed Values Added
Description fastify versions >= 4.0.0 and before 5.12.2 can route a malformed URL sent under one plugin prefix to the custom not-found handler of a different sibling plugin, and invoke it without the preHandler hook declared for that handler. The internal not-found router for encapsulated handlers dispatches malformed paths through a single shared handler pointer before URL decoding, ignoring the prefix and skipping the selected handler's normal lifecycle. An unauthenticated attacker can therefore reach an authentication-protected private fallback through an unrelated public prefix and read its full response, bypassing the authentication hook and breaking prefix encapsulation. Users should upgrade to fastify 5.12.2 or later.
Title fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers
Weaknesses CWE-288
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: openjs

Published:

Updated: 2026-09-04T16:20:02.318Z

Reserved: 2026-08-19T09:33:54.670Z

Link: CVE-2026-76169

cve-icon Vulnrichment

Updated: 2026-09-04T16:19:57.827Z

cve-icon NVD

Status : Received

Published: 2026-09-04T10:17:12.020

Modified: 2026-09-04T17:16:57.903

Link: CVE-2026-76169

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-04T09:51:03Z

Links: CVE-2026-76169 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-04T14:00:05Z

Weaknesses
  • CWE-288

    Authentication Bypass Using an Alternate Path or Channel

  • CWE-289

    Authentication Bypass by Alternate Name