# Fastify Middie vulnerabilities Source: https://junglewise.ai/threats/technologies/middie Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/middie.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 7 vulnerabilities in Fastify Middie: 0 in the last 7 days and 2 in the last 90 days, 5 of them critical and 0 exploited in the wild. The most recent, CVE-2026-112712, was published on 20 October 2026. 1 vulnerability in the last four weeks, up from none in the four before. 1 critical against 0. ## Counts - Last 7 days: 0 - Last 30 days: 1 - Last 90 days: 2 - All time: 7 (5 critical, 0 exploited in the wild) ## About Fastify Middie Fastify middleware plugin that provides middleware support for the Fastify framework. ## Latest Fastify Middie vulnerabilities - [CVE-2026-112712: @fastify/middie path-scoped middleware bypass via scope prefix mismatch](https://junglewise.ai/threats/cve-2026-112712-fastify-middie-is-the-express-style-middleware-engine-for) (critical, CVSS 9.1, published 20 Oct 2026) - [CVE-2026-85184: @fastify/middie path-scoped middleware bypass via absolute-form request](https://junglewise.ai/threats/cve-2026-85184-fastify-middie-path-scoped-middleware-bypass-via-absolute-form) (critical, CVSS 9.1, published 4 Sep 2026) - [CVE-2026-14198: Fastify @fastify/middie authorization bypass via encoded slash in path parameters](https://junglewise.ai/threats/cve-2026-14198-fastify-fastify-middie-authorization-bypass-via-encoded-slash-in) (critical, CVSS 9.1, published 1 Jul 2026) - [CVE-2026-33804: Fastify @fastify/middie middleware bypass via duplicate slashes](https://junglewise.ai/threats/cve-2026-33804-fastify-fastify-middie-middleware-bypass-via-duplicate-slashes) (high, CVSS 7.4, published 16 Apr 2026) - [CVE-2026-6270: Fastify @fastify/middie authentication bypass in child plugin scopes](https://junglewise.ai/threats/cve-2026-6270-fastify-fastify-middie-middleware-bypass-in-child-plugin-scopes) (critical, CVSS 9.1, published 16 Apr 2026) - [CVE-2026-2880: Fastify @fastify/middie auth bypass via improper path normalization](https://junglewise.ai/threats/cve-2026-2880-fastify-fastify-middie-auth-bypass-via-improper-path-normalization) (critical, CVSS 9.1, published 27 Feb 2026) - [CVE-2026-22031: Fastify @fastify/middie middleware path bypass via URL encoding](https://junglewise.ai/threats/cve-2026-22031-fastify-fastify-middie-middleware-path-bypass-via-url-encoding) (high, CVSS 8.4, published 19 Jan 2026) ## Most severe Fastify Middie vulnerabilities - [CVE-2026-6270: Fastify @fastify/middie authentication bypass in child plugin scopes](https://junglewise.ai/threats/cve-2026-6270-fastify-fastify-middie-middleware-bypass-in-child-plugin-scopes) (critical, CVSS 9.1, published 16 Apr 2026) - [CVE-2026-85184: @fastify/middie path-scoped middleware bypass via absolute-form request](https://junglewise.ai/threats/cve-2026-85184-fastify-middie-path-scoped-middleware-bypass-via-absolute-form) (critical, CVSS 9.1, published 4 Sep 2026) - [CVE-2026-2880: Fastify @fastify/middie auth bypass via improper path normalization](https://junglewise.ai/threats/cve-2026-2880-fastify-fastify-middie-auth-bypass-via-improper-path-normalization) (critical, CVSS 9.1, published 27 Feb 2026) - [CVE-2026-112712: @fastify/middie path-scoped middleware bypass via scope prefix mismatch](https://junglewise.ai/threats/cve-2026-112712-fastify-middie-is-the-express-style-middleware-engine-for) (critical, CVSS 9.1, published 20 Oct 2026) - [CVE-2026-14198: Fastify @fastify/middie authorization bypass via encoded slash in path parameters](https://junglewise.ai/threats/cve-2026-14198-fastify-fastify-middie-authorization-bypass-via-encoded-slash-in) (critical, CVSS 9.1, published 1 Jul 2026) - [CVE-2026-22031: Fastify @fastify/middie middleware path bypass via URL encoding](https://junglewise.ai/threats/cve-2026-22031-fastify-fastify-middie-middleware-path-bypass-via-url-encoding) (high, CVSS 8.4, published 19 Jan 2026) - [CVE-2026-33804: Fastify @fastify/middie middleware bypass via duplicate slashes](https://junglewise.ai/threats/cve-2026-33804-fastify-fastify-middie-middleware-bypass-via-duplicate-slashes) (high, CVSS 7.4, published 16 Apr 2026) ## Vulnerabilities per week 1 vulnerability in the last four weeks, up from none in the four before. 1 critical against 0. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 1 | 1 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 1 | 1 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Fastify technologies - [Fastify-Express](https://junglewise.ai/threats/technologies/express): 9 vulnerabilities - [Fastify Http-Proxy](https://junglewise.ai/threats/technologies/http-proxy): 7 vulnerabilities - [Fastify Multipart](https://junglewise.ai/threats/technologies/multipart): 4 vulnerabilities - [Fastify Reply-From](https://junglewise.ai/threats/technologies/reply-from): 4 vulnerabilities - [Fastify-Static](https://junglewise.ai/threats/technologies/static): 4 vulnerabilities - [Fastify Busboy](https://junglewise.ai/threats/technologies/busboy): 3 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Fastify Middie vulnerabilities", https://junglewise.ai/threats/technologies/middie, 9 November 2026.