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Home / CVE DB / CVE-2026-33804
Standard
Vulnerability Identifier

CVE-2026-33804

2026-04-16
Severity Assessment
7.4
HIGH
CVSS v3.x Score
Clinical Analysis (Description)

@fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's router, allowing requests with duplicate slashes to bypass middleware authentication and authorization checks. This only affects applications using the deprecated ignoreDuplicateSlashes option. Upgrade to @fastify/middie 9.3.2 to fix this issue. There are no workarounds other than disabling the ignoreDuplicateSlashes option.

Vector Sequencing

Attack Parameters

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Impact Consequences

Technical Impact

Unchanged
Scope
High
Confidentiality
High
Integrity
None
Availability
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Classification

CWE-CWE-436

View CWE Details ↗
Timeline

Time Line

PUBLICATION
16 Apr 2026
MODIFICATION
22 Apr 2026
Impact Statistics

Key Metrics

CVSS Score
7.4
HIGH
Remediation Protocol

Recommended Solution

No automatic solution found. Check vendor references.
Patch Library
No direct patch listed in database.
Recommended Actions for Administrators

Immediate Action Plan

1. Inventory

Identify all affected systems in your infrastructure.

2. Assessment

Assess exposure and criticality for your organization.

3. Mitigation

Apply patches or available workarounds.

4. Verification

Test and confirm effectiveness of applied measures.

Sources & Bibliography
NIST NVD MITRE CVE External Reference ↗ External Reference ↗