The vulnerability of the enhanceRequest function in the Fastify Node.js software framework allows a attacker to compromise the confidentiality, integrity, and accessibility of the protected information.

The vulnerability of the enhanceRequest function in the Fastify Node.js software framework is related to the occurrence of interpretation conflicts when processing HTTP header names and values. Exploiting this vulnerability allows a remote attacker to compromise the confidentiality, integrity, an...

The vulnerability of the rewriteRequestHeaders() function in the Fastify framework, a Node.js software platform, allows a malicious actor to gain unauthorized access and modify protected information.

The vulnerability of the rewriteRequestHeaders function in the Fastify framework, a Node.js software platform, is related to HTTP request processing flaws. Exploiting this vulnerability can allow an attacker, operating remotely, to gain unauthorized access and modify protected information...

GHSA-PR96-94W5-MX2H @fastify/static vulnerable to path traversal in directory listing

Impact @fastify/static v9.1.0 and earlier serves directory listings outside the configured static root when the list option is enabled. A request such as /public/../outside/ causes dirList.path to resolve a directory outside the root via path.join without a containment check. A remote...

@13w/local-rag (>=1.6.0, <=1.7.2), @24letters/devservers (>=0.1.0, <=0.6.0) +778 more potentially affected by CVE-2026-6410 via @fastify/static (>=8.0.0, <=9.1.0)

@fastify/static NPM version =8.0.0, =1.6.0, =0.1.0, =0.1.0, =0.4.0, =0.1.0-rc.1, =0.1.0, =1.1.0, =1.1.0, =0.0.18, =1.0.0, =1.0.0, =1.0.0, =1.0.0, =0.1.0, =0.1.3 and more Source cves: CVE-2026-6410 Source advisory: OSV:GHSA-PR96-94W5-MX2H...

@fastify/static vulnerable to path traversal in directory listing

Impact @fastify/static v9.1.0 and earlier serves directory listings outside the configured static root when the list option is enabled. A request such as /public/../outside/ causes dirList.path to resolve a directory outside the root via path.join without a containment check. A remote...

EUVD-2026-23243

@fastify/static vulnerable to path traversal in directory listing...

@fastify/static vulnerable to route guard bypass via encoded path separators

Impact @fastify/static v9.1.0 and earlier decodes percent-encoded path separators %2F before filesystem resolution, but Fastify's router treats them as literal characters. This creates a routing mismatch: route guards on /admin/ do not match /admin%2Fsecret.html, but @fastify/static decodes it to...

EUVD-2026-23227

@fastify/static vulnerable to route guard bypass via encoded path separators...

@13w/local-rag (>=1.6.0, <=1.7.2), @24letters/devservers (>=0.1.0, <=0.6.0) +778 more potentially affected by CVE-2026-6414 via @fastify/static (>=8.0.0, <=9.1.0)

@fastify/static NPM version =8.0.0, =1.6.0, =0.1.0, =0.1.0, =0.4.0, =0.1.0-rc.1, =0.1.0, =1.1.0, =1.1.0, =0.0.18, =1.0.0, =1.0.0, =1.0.0, =1.0.0, =0.1.0, =0.1.3 and more Source cves: CVE-2026-6414 Source advisory: OSV:GHSA-X428-GHPX-8J92...

GHSA-X428-GHPX-8J92 @fastify/static vulnerable to route guard bypass via encoded path separators

Impact @fastify/static v9.1.0 and earlier decodes percent-encoded path separators %2F before filesystem resolution, but Fastify's router treats them as literal characters. This creates a routing mismatch: route guards on /admin/ do not match /admin%2Fsecret.html, but @fastify/static decodes it to...

EUVD-2026-23241

@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes...

@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes

Impact @fastify/middie v9.3.1 and earlier incorrectly re-prefixes middleware paths when propagating them to child plugin scopes. When a child plugin is registered with a prefix that overlaps with a parent-scoped middleware path, the middleware path is modified during inheritance and silently fail...

@bechara/crux (>=6.0.0-alpha.1, <=6.6.2), @cappa/cli (>=0.1.0, <=0.8.2) +11 more potentially affected by CVE-2026-6270 via @fastify/middie (>=9.0.2, <=9.3.1)

@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, =1.1.92 Source cves: CVE-2026-6270 Source advisory: SNYK:JS-FASTIFYMIDDIE-16098213...

GHSA-72C6-FX6Q-FR5W @fastify/middie vulnerable to middleware authentication bypass in child plugin scopes

Impact @fastify/middie v9.3.1 and earlier incorrectly re-prefixes middleware paths when propagating them to child plugin scopes. When a child plugin is registered with a prefix that overlaps with a parent-scoped middleware path, the middleware path is modified during inheritance and silently fail...

@bechara/crux (>=6.0.0-alpha.1, <=6.6.2), @cappa/cli (>=0.1.0, <=0.8.2) +11 more potentially affected by CVE-2026-6270 via @fastify/middie (>=9.0.2, <=9.3.1)

@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, =1.1.92 Source cves: CVE-2026-6270 Source advisory: OSV:GHSA-72C6-FX6Q-FR5W...

Interpretation Conflict

Overview @fastify/middie is a Middleware engine for Fastify Affected versions of this package are vulnerable to Interpretation Conflict in the resolveNormalizationOptions function's deprecated ignoreDuplicateSlashes configuration option. An attacker can bypass middleware by crafting URLs with...

@bechara/crux (>=6.0.0-alpha.1, <=6.6.2), @cappa/cli (>=0.1.0, <=0.8.2) +11 more potentially affected by CVE-2026-33804 via @fastify/middie (>=9.0.2, <=9.3.1)

@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, =1.1.92 Source cves: CVE-2026-33804 Source advisory: SNYK:JS-FASTIFYMIDDIE-16098212...

EUVD-2026-23235

@fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option...

@fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option

Impact @fastify/middie v9.3.1 and earlier does not read the deprecated but still functional top-level ignoreDuplicateSlashes option, only reading from routerOptions. This creates a normalization gap: Fastify's router normalizes duplicate slashes but middie does not, allowing middleware bypass via...

@bechara/crux (>=6.0.0-alpha.1, <=6.6.2), @cappa/cli (>=0.1.0, <=0.8.2) +11 more potentially affected by CVE-2026-33804 via @fastify/middie (>=9.0.2, <=9.3.1)

@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, =1.1.92 Source cves: CVE-2026-33804 Source advisory: OSV:GHSA-V9WW-2J6R-98Q6...