CVE-2026-16117: Improper Input Validation

Impact: @fastify/http-proxy versions up to and including 11.5.0 fail to rewrite the request prefix when the prefix segment is URL-encoded. Fastify's router URL-decodes paths for route matching, but request.url retains the original encoded form, and the prefix-rewrite step uses a literal string...

PT-2026-60935

Name of the Vulnerable Software and Affected Versions @fastify/reply-from versions 8.3.1 through 12.6.3 Description Internal URL cache keys are constructed by concatenating the destination and source paths without a delimiter. This allows different destination and source pairs to generate identic...

PT-2026-60960

Name of the Vulnerable Software and Affected Versions @fastify/http-proxy versions 9.4.0 through 11.5.0 Description WebSocket destination paths are not properly validated against the configured rewrite prefix. The WebSocketProxy.findUpstream function resolves destinations using the WHATWG URL...

CVE-2026-16158: Unintended Proxy or Intermediary

Impact: @fastify/reply-from versions from 8.3.1 up to but not including 12.6.4 build the internal URL cache key by concatenating the destination and source path without a delimiter. Different destination and source pairs can therefore produce the same key while resolving to different upstream URL...

CVE-2026-15631: Improper Limitation of a Pathname to a Restricted Directory

Impact: @fastify/http-proxy versions from 9.4.0 up to and including 11.5.0 fail to validate the resolved WebSocket destination path against the configured rewrite prefix. The WebSocket routing path in WebSocketProxy.findUpstream resolves the destination via the WHATWG URL constructor, which...

PT-2026-60961

Name of the Vulnerable Software and Affected Versions @fastify/http-proxy versions prior to 11.6.0 Description An improper input normalization issue exists where the software fails to rewrite the request prefix when the prefix segment is URL-encoded. While the router URL-decodes paths for route...

Malicious code in fastify-addone (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector 21b9e477cff478ab071039c18c3adb6577a07cc1d82687b9e7d7cd2594dc9ddf The package presents itself as fastify-plugin name fastify-addone, repository/homepage/bugs fields point at fastify/fastify-plugin and copies that...

MAL-2026-10098 Malicious code in fastify-addone (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector 21b9e477cff478ab071039c18c3adb6577a07cc1d82687b9e7d7cd2594dc9ddf The package presents itself as fastify-plugin name fastify-addone, repository/homepage/bugs fields point at fastify/fastify-plugin and copies that...

@arenahito/droid-webscr (>=0.2.1, <=0.6.0), @cappa/cli (>=0.4.4, <=0.10.4) +2 more potentially affected by CVE-2026-14181 via @fastify/middie (>=9.1.0, <=9.3.2)

@fastify/middie NPM version =9.1.0, =0.2.1, =0.4.4, =0.2.8, =1.0.0-alpha.23, =1.0.0-alpha.28 Source cves: CVE-2026-14181 Source advisory: SNYK:JS-FASTIFYMIDDIE-17753355...

@arenahito/droid-webscr (>=0.2.1, <=0.6.0), @cappa/cli (>=0.4.4, <=0.10.4) +2 more potentially affected by CVE-2026-14198 via @fastify/middie (>=9.1.0, <=9.3.2)

@fastify/middie NPM version =9.1.0, =0.2.1, =0.4.4, =0.2.8, =1.0.0-alpha.23, =1.0.0-alpha.28 Source cves: CVE-2026-14198 Source advisory: SNYK:JS-FASTIFYMIDDIE-17753414...

Interpretation Conflict

Overview @fastify/middie is a Middleware engine for Fastify Affected versions of this package are vulnerable to Interpretation Conflict via the path parameter handling process. An attacker can gain unauthorized access to protected route handlers by sending a crafted URL containing an encoded slas...

CVE-2026-14198

@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to...

CVE-2026-14181

@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder t...

CVE-2026-14181 @fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths

@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder t...

CVE-2026-14181

@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder t...

EUVD-2026-40947

@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder t...

CVE-2026-14181 @fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths

@fastify/middie versions 9.1.0 through 9.3.2 fail to guard the URL normalization step used by the standalone engine when incoming request paths contain malformed percent-encoded sequences. Inputs such as an incomplete percent escape or a truncated multibyte sequence cause the underlying decoder t...

CVE-2026-14198

@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to...

CVE-2026-14198 @fastify/middie vulnerable to authorization bypass via encoded slash in path parameter values

@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to...

CVE-2026-14198 @fastify/middie vulnerable to authorization bypass via encoded slash in path parameter values

@fastify/middie versions 9.1.0 through 9.3.2 decode the encoded slash %2F inside path parameter values before matching middleware paths, while Fastify's underlying router preserves the encoding during route lookup. The two layers disagree on the canonical request path, so the middleware fails to...