NPM: fastify vulnerable to X-Forwarded-* spoofing under trustProxy hop-count

NPM: fastify vulnerable to X-Forwarded- spoofing under trustProxy hop-count vulnerability discovered by ? in WordPress Npm fastify versions = 5.8.3, 5.12.1...

fastify vulnerable to X-Forwarded-* spoofing under trustProxy hop-count

Impact The fix for CVE-2026-3635 GHSA-444r-cwp2-x5xf added a proxyFnsocket.remoteAddress, 0 guard on the X-Forwarded- reads in request.host, request.protocol, request.hostname, request.ip, and request.ips. That guard closes the IP, CIDR, and custom-function forms of trustProxy correctly because...

EUVD-2026-61222

fastify vulnerable to X-Forwarded- spoofing under trustProxy hop-count...

GHSA-3M5P-2C4R-XXW2 fastify vulnerable to X-Forwarded-* spoofing under trustProxy hop-count

Impact The fix for CVE-2026-3635 GHSA-444r-cwp2-x5xf added a proxyFnsocket.remoteAddress, 0 guard on the X-Forwarded- reads in request.host, request.protocol, request.hostname, request.ip, and request.ips. That guard closes the IP, CIDR, and custom-function forms of trustProxy correctly because...

CVE-2026-16732

A flaw was found in fastify. When configured with a numeric trustProxy value, an attacker who can directly access the Fastify origin, bypassing the front-facing proxy, can spoof forwarded request fields. This vulnerability allows for host injection in generated URLs, bypasses HTTPS enforcement, a...

Reliance on Untrusted Inputs in a Security Decision

Overview fastify is an overhead web framework, for Node.js. Affected versions of this package are vulnerable to Reliance on Untrusted Inputs in a Security Decision through the getTrustProxyFn hop-count handling in lib/request.js when trustProxy is configured as a number. An attacker can overwrite...

CVE-2026-16732

fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard on the forwarded-header reads used to derive the request host, protocol, hostname, ip, and ips values, checking the connecting address. That guard closes the IP, CIDR, and custom-function...

CVE-2026-16732

Fastify 5.8.3–5.12.0 remains vulnerable to X-Forwarded-* spoofing when trustProxy is set numerically (e.g., 1), because the CVE-2026-3635 guard predicate ignores the connecting address. This enables host injection, HTTPS-enforcement bypass, secure-cookie/CSRF-origin bypass, and cache poisoning. P...

CVE-2026-16732 fastify vulnerable to X-Forwarded-* spoofing under trustProxy hop-count

fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard on the forwarded-header reads used to derive the request host, protocol, hostname, ip, and ips values, checking the connecting address. That guard closes the IP, CIDR, and custom-function...

CVE-2026-16732

fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard on the forwarded-header reads used to derive the request host, protocol, hostname, ip, and ips values, checking the connecting address. That guard closes the IP, CIDR, and custom-function...

CVE-2026-16732 fastify vulnerable to X-Forwarded-* spoofing under trustProxy hop-count

fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard on the forwarded-header reads used to derive the request host, protocol, hostname, ip, and ips values, checking the connecting address. That guard closes the IP, CIDR, and custom-function...

CVE-2026-16732 fastify vulnerable to X-Forwarded-* spoofing under trustProxy hop-count

fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard on the forwarded-header reads used to derive the request host, protocol, hostname, ip, and ips values, checking the connecting address. That guard closes the IP, CIDR, and custom-function...

PT-2026-77311

Name of the Vulnerable Software and Affected Versions fastify versions 5.8.3 through 5.12.0 Description An issue exists in the handling of forwarded-header reads used to derive request host, protocol, hostname, ip, and ips values. When the trustProxy setting is configured with a numeric hop-count...

CVE-2026-16732: Use of Less Trusted Source

fastify is a fast and low overhead web framework for Node.js. Impact: the fix for CVE-2026-3635 added a guard on the forwarded-header reads used to derive the request host, protocol, hostname, ip, and ips values, checking the connecting address. That guard closes the IP, CIDR, and custom-function...

CVE-2026-15144

@fastify/rate-limit before 11.2.0 keys rate-limit buckets by the verbatim client IP string returned from request.ip. Because a single IPv6 client can control a large address range a /64 holds 2^64 distinct addresses and the same address has multiple valid textual representations, an IPv6 capable...

CVE-2026-3635

A flaw was found in fastify. When the trustProxy option is configured with a restrictive trust function, such as a specific IP, a subnet, a hop count or a custom function, the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection,...

CVE-2026-3635 Fastify request.protocol and request.host spoofable via X-Forwarded-Proto/Host from untrusted connections when trustProxy uses restrictive trust function

Summary When trustProxy is configured with a restrictive trust function e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function, the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including...

CVE-2026-3635

Summary When trustProxy is configured with a restrictive trust function e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function, the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including...

CVE-2026-3635

Summary When trustProxy is configured with a restrictive trust function e.g., a specific IP like trustProxy: '10.0.0.1', a subnet, a hop count, or a custom function, the request.protocol and request.host getters read X-Forwarded-Proto and X-Forwarded-Host headers from any connection — including...

Fastify security vulnerabilities

Fastify is an open-source web framework developed by Fastify. Versions of Fastify 5.8.2 and earlier contain security vulnerabilities. These vulnerabilities arise when the trustProxy is configured as a restrictive trust function, allowing request.protocol and request.host to read the...