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CVE-2026-2880 Detail

Description

A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)). When Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  openjs
CVSS-B 8.2 HIGH
Vector:  CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/fastify/middie/security/advisories/GHSA-8p85-9qpw-fwgw openjs

Weakness Enumeration

CWE-ID CWE Name Source
CWE-20 Improper Input Validation openjs  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-2880
NVD Published Date:
02/27/2026
NVD Last Modified:
02/27/2026
Source:
openjs