fastify middie up to 9.1.x Request authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in fastify middie up to 9.1.x. This vulnerability affects unknown code of the component Request Handler. Executing a manipulation can lead to authorization. This vulnerability appears as CVE-2026-2880. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in fastify middie up to 9.1.x. It has been declared as problematic. This vulnerability affects an unknown function of the component Request Handler. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-2880 since 02/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 9.2.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-9049). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

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Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 7.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 9.1
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-639 / CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: middie 9.2.0

Timelineinfo

02/20/2026 CVE reserved
02/27/2026 +7 days Advisory disclosed
02/27/2026 +0 days VulDB entry created
03/19/2026 +20 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-8p85-9qpw-fwgw
Status: Confirmed

CVE: CVE-2026-2880 (🔒)
GCVE (CVE): GCVE-0-2026-2880
GCVE (VulDB): GCVE-100-348208
EUVD: 🔒

Entryinfo

Created: 02/27/2026 22:17
Updated: 03/19/2026 23:07
Changes: 02/27/2026 22:17 (67), 02/28/2026 06:01 (1), 03/03/2026 14:55 (1), 03/19/2026 23:07 (11)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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