GHSA-MRQ3-VJJR-P77C Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream

Impact A Denial of Service vulnerability in Fastify’s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream or Response with a Web Stream body via reply.send are impacted. A slow or non-reading client can trigger unbounded...

@amedia/brick-mcp (>=0.0.0-vEXPORT-20260113150210, <=0.1.5), @andesite-lab/andesite-core (>=1.60.2, <=1.61.0) +264 more potentially affected by CVE-2026-25224 via fastify (>=5.0.0, <=5.7.2)

fastify NPM version =5.0.0, =0.0.0-vEXPORT-20260113150210, =1.60.2, =2.0.1, =1.1.1, =0.1.1, =0.1.1, =0.1.1, =0.0.35, =0.0.82, =0.0.1, =0.0.6, =0.1.68, =6.0.0-alpha.1, =0.2.305, =1.0.6, =1.0.22 and more Source cves: CVE-2026-25224 Source advisory: OSV:GHSA-MRQ3-VJJR-P77C...

Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream

Impact A Denial of Service vulnerability in Fastify’s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream or Response with a Web Stream body via reply.send are impacted. A slow or non-reading client can trigger unbounded...

GHSA-JX2C-RXCM-JVMQ Fastify's Content-Type header tab character allows body validation bypass

Impact A validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character \t followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the serve...

Interpretation Conflict

Overview fastify is an overhead web framework, for Node.js. Affected versions of this package are vulnerable to Interpretation Conflict via the Content-Type header processing. An attacker can bypass body validation by appending a tab character \t and arbitrary content to the Content-Type header,...

@amedia/brick-mcp (>=0.0.0-vEXPORT-20260113150210, <=0.1.5), @andesite-lab/andesite-core (>=1.60.2, <=1.61.0) +263 more potentially affected by CVE-2026-25223 via fastify (>=5.0.0, <=5.7.1)

fastify NPM version =5.0.0, =0.0.0-vEXPORT-20260113150210, =1.60.2, =2.0.1, =1.1.1, =0.1.1, =0.1.1, =0.1.1, =0.0.35, =0.0.82, =0.0.1, =0.0.6, =0.1.68, =6.0.0-alpha.1, =0.2.305, =1.0.6, =1.0.22 and more Source cves: CVE-2026-25223 Source advisory: OSV:GHSA-JX2C-RXCM-JVMQ...

@amedia/brick-mcp (>=0.0.0-vEXPORT-20260113150210, <=0.1.5), @andesite-lab/andesite-core (>=1.60.2, <=1.61.0) +263 more potentially affected by CVE-2026-25223 via fastify (>=5.0.0, <=5.7.1)

fastify NPM version =5.0.0, =0.0.0-vEXPORT-20260113150210, =1.60.2, =2.0.1, =1.1.1, =0.1.1, =0.1.1, =0.1.1, =0.0.35, =0.0.82, =0.0.1, =0.0.6, =0.1.68, =6.0.0-alpha.1, =0.2.305, =1.0.6, =1.0.22 and more Source cves: CVE-2026-25223 Source advisory: SNYK:JS-FASTIFY-15182642...

Fastify's Content-Type header tab character allows body validation bypass

Impact A validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character \t followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the serve...

PT-2026-6281

Name of the Vulnerable Software and Affected Versions Fastify versions prior to 5.7.2 Description Fastify is a web framework for Node.js. A validation bypass exists where request body validation schemas specified by Content-Type can be circumvented. Appending a tab character t followed by arbitra...

PT-2026-6444

Impact A validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character t followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server...

PT-2026-5743

Name of the Vulnerable Software and Affected Versions Fastify versions prior to 5.7.3 Description Fastify is a web framework for Node.js. A denial-of-service condition exists in Fastify’s Web Streams response handling. A slow or non-reading client can cause unbounded buffering when backpressure i...

Fastify: DoS via Unbounded Memory Allocation in sendWebStream on Fastify v5.7.0+ leads to OOM crash when backpressure is ignored

A vulnerability was discovered in Fastify versions 5.7.0 and later. The issue was in the "sendWebStream" function, which failed to handle TCP backpressure correctly. When a ReadableStream was sent as a response, Fastify continuously pulled data from the stream producer and wrote it to the respons...

CVE-2026-22037

The @fastify/express plugin adds full Express compatibility to Fastify. A security vulnerability exists in @fastify/express prior to version 4.0.3 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters e.g., /%61dmin instead of /admin. While the...

@fastify/express vulnerable to Improper Handling of URL Encoding (Hex Encoding)

Summary A security vulnerability exists in @fastify/express where middleware registered with a specific path prefix can be bypassed using URL-encoded characters e.g., /%61dmin instead of /admin. While the middleware engine fails to match the encoded path and skips execution, the underlying Fastif...

@cmmn/tools (>=3.0.0-alpha-1, <=3.0.0-alpha-6), mikr0 (0.1.10) potentially affected by CVE-2026-22037 via @fastify/express (>=4.0.1, <=4.0.2)

@fastify/express NPM version =4.0.1, =3.0.0-alpha-1, =3.0.0-alpha-6 - mikr0 0.1.10 Source cves: CVE-2026-22037 Source advisory: OSV:GHSA-G6Q3-96CP-5R5M...

GHSA-G6Q3-96CP-5R5M @fastify/express vulnerable to Improper Handling of URL Encoding (Hex Encoding)

Summary A security vulnerability exists in @fastify/express where middleware registered with a specific path prefix can be bypassed using URL-encoded characters e.g., /%61dmin instead of /admin. While the middleware engine fails to match the encoded path and skips execution, the underlying Fastif...

EUVD-2026-3321

Fastify Middie Middleware Path Bypass...

@bechara/crux (>=6.0.0-alpha.1, <=6.6.2), @cappa/cli (>=0.1.0, <=0.4.3) +11 more potentially affected by CVE-2026-22031 +1 more via @fastify/middie (>=9.0.2, <=9.0.3)

@fastify/middie NPM version =9.0.2, =6.0.0-alpha.1, =0.1.0, =0.1.0, =1.0.0-develop-pedago.0, =1.0.11, =0.1.51, =1.0.36, =11.0.0-next.1, =1.3.0, =5.0.0-beta.36, =0.6.1-dev, =1.1.48 Source cves: CVE-2026-22031, CVE-2026-6414 Source advisory: OSV:GHSA-CXRG-G7R8-W69P...

GHSA-CXRG-G7R8-W69P Fastify Middie Middleware Path Bypass

Summary A security vulnerability exists in @fastify/middie where middleware registered with a specific path prefix can be bypassed using URL-encoded characters e.g., /%61dmin instead of /admin. While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify...

Fastify Middie Middleware Path Bypass

Summary A security vulnerability exists in @fastify/middie where middleware registered with a specific path prefix can be bypassed using URL-encoded characters e.g., /%61dmin instead of /admin. While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify...