PT-2026-91005

TuxCare rebuilt fastify to address 2 CVEs. Fixed in 5.11.3-tuxcare.1...

PT-2026-84985

@fastify/http-proxy versions before 11.6.2 do not validate proxied HTTP request paths for backslash based dot-segments before forwarding them to the configured upstream. The plain HTTP request handler skips the destination validation that the WebSocket path performs, and the underlying reply-from...

PT-2026-90915

TuxCare rebuilt fastify to address 1 CVE. Fixed in 4.29.1-tuxcare.3...

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...

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...

@agent-tool-platform/agent-kit (>=0.2.0, <=0.4.0), @agent-tool-platform/ast-summarizer (>=0.1.0, <=0.1.1) +315 more potentially affected by CVE-2026-16732 +1 more via fastify (>=5.8.3, <=5.12.0)

fastify NPM version =5.8.3, =0.2.0, =0.1.0, =0.1.0, =0.1.0, =0.0.0-vBETA-20260417080530, =0.0.1, =1.0.0, =0.0.0, =1.1.4, =4.0.0, =1.0.0-rc.2, =0.6.7, =0.6.7, =0.6.8 and more Source cves: CVE-2026-16732, CVE-2026-3635 Source advisory: GHSA-3M5P-2C4R-XXW2...

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...

@agent-tool-platform/agent-kit (>=0.2.0, <=0.4.0), @agent-tool-platform/ast-summarizer (>=0.1.0, <=0.1.1) +315 more potentially affected by CVE-2026-16732 via fastify (>=5.8.3, <=5.12.0)

fastify NPM version =5.8.3, =0.2.0, =0.1.0, =0.1.0, =0.1.0, =0.0.0-vBETA-20260417080530, =0.0.1, =1.0.0, =0.0.0, =1.1.4, =4.0.0, =1.0.0-rc.2, =0.6.7, =0.6.7, =0.6.8 and more Source cves: CVE-2026-16732 Source advisory: OSV:GHSA-3M5P-2C4R-XXW2...

GHSA-W2QP-RPH6-63G4 fastify vulnerable to schema validation bypass via root primitive coercion mismatch

Impact fastify before 5.12.1, when a route uses a root-level primitive body schema for example an integer with a minimum and maximum and the default type coercion, validates the coerced value but exposes the original, uncoerced value to the route handler. For example, a JSON body "10" is coerced ...

NPM: fastify vulnerable to schema validation bypass via root primitive coercion mismatch

NPM: fastify vulnerable to schema validation bypass via root primitive coercion mismatch vulnerability discovered by ? in WordPress Npm fastify versions 5.12.1...

fastify vulnerable to schema validation bypass via root primitive coercion mismatch

Impact fastify before 5.12.1, when a route uses a root-level primitive body schema for example an integer with a minimum and maximum and the default type coercion, validates the coerced value but exposes the original, uncoerced value to the route handler. For example, a JSON body "10" is coerced ...

@agent-tool-platform/agent-kit (>=0.2.0, <=0.4.0), @agent-tool-platform/ast-summarizer (>=0.1.0, <=0.1.1) +512 more potentially affected by CVE-2026-18504 via fastify (>=5.0.0-alpha.2, <=5.12.0)

fastify NPM version =5.0.0-alpha.2, =0.2.0, =0.1.0, =0.1.0, =0.1.0, =0.0.0-vBETA-20260417080530, =0.0.1, =1.60.2, =1.0.0, =0.0.0, =2.0.1, =1.1.1, =1.1.4, =1.2.0 and more Source cves: CVE-2026-18504 Source advisory: GHSA-W2QP-RPH6-63G4...

EUVD-2026-61221

fastify vulnerable to schema validation bypass via root primitive coercion mismatch...

@agent-tool-platform/agent-kit (>=0.2.0, <=0.4.0), @agent-tool-platform/ast-summarizer (>=0.1.0, <=0.1.1) +512 more potentially affected by CVE-2026-18504 via fastify (>=5.0.0-alpha.2, <=5.12.0)

fastify NPM version =5.0.0-alpha.2, =0.2.0, =0.1.0, =0.1.0, =0.1.0, =0.0.0-vBETA-20260417080530, =0.0.1, =1.60.2, =1.0.0, =0.0.0, =2.0.1, =1.1.1, =1.1.4, =1.2.0 and more Source cves: CVE-2026-18504 Source advisory: OSV:GHSA-W2QP-RPH6-63G4...

CVE-2026-74866

A flaw was found in @fastify/busboy, a Node.js multipart form-data parser. The parser incorrectly handles lone carriage return or line feed characters in multipart part headers, treating them as part of the filename or field name rather than as line breaks. A remote attacker could exploit this by...

CVE-2026-18504

A flaw was found in fastify. A remote attacker can bypass schema validation when a request body schema targets a root primitive value. This occurs because the validation process may coerce a JSON string into an expected type, but the original unvalidated string is then passed to the application...

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...

PT-2026-86434

Root has patched AIKIDO-2026-961622 in the @fastify/busboy package for Root:npm. Multiple fixed versions available...

SUSE CVE-2026-74866

@fastify/busboy is a multipart form-data parser for Node.js. Its multipart part-header parser splits header lines only on the two-byte carriage-return line-feed sequence, so a lone carriage return or line feed embedded in a part header is not treated as a line break and is carried verbatim into t...