CVE-2026-22031
- Source
- https://cve.org/CVERecord?id=CVE-2026-22031
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22031.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-22031
- Aliases
- Published
- 2026-01-19T15:24:45.899Z
- Modified
- 2026-03-15T14:15:04.894883Z
- Severity
-
- 8.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L CVSS Calculator
- Summary
- Fastify Middie Middleware Path Bypass
- Details
-
@fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g.,
/%61dmininstead of/admin). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endpoints without the middleware constraints. Version 9.1.0 fixes the issue. - Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22031.json", "cwe_ids": [ "CWE-177" ], "cna_assigner": "GitHub_M" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22031.json
- https://github.com/fastify/middie/commit/d44cd56eb724490babf7b452fdbbdd37ea2effba
- https://github.com/fastify/middie/pull/245
- https://github.com/fastify/middie/releases/tag/v9.1.0
- https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p
- https://nvd.nist.gov/vuln/detail/CVE-2026-22031
Affected packages
Git / github.com/fastify/middie
Affected ranges
- Type
- GIT
- Repo
- https://github.com/fastify/middie
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed