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4 vulnerabilities found for @fastify/express by fastify
CVE-2026-33808 (GCVE-0-2026-33808)
Vulnerability from nvd – Published: 2026-04-15 09:29 – Updated: 2026-04-15 13:10
VLAI
Title
@fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)
Summary
Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path.
PatchesUpgrade to @fastify/express v4.0.5 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | @fastify/express |
Affected:
0 , < 4.0.5
(semver)
Unaffected: 4.0.5 (semver) |
Credits
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CVE-2026-33807 (GCVE-0-2026-33807)
Vulnerability from nvd – Published: 2026-04-15 09:52 – Updated: 2026-04-15 13:09
VLAI
Title
@fastify/express vulnerable to middleware path doubling causing authentication bypass in child plugin scopes
Summary
@fastify/express v4.0.4 and earlier contains a path handling bug in the onRegister function that causes middleware paths to be doubled when inherited by child plugins. When a child plugin is registered with a prefix that matches a middleware path, the middleware path is prefixed a second time, causing it to never match incoming requests. This results in complete bypass of Express middleware security controls, including authentication, authorization, and rate limiting, for all routes defined within affected child plugin scopes. No special configuration or request crafting is required.
Upgrade to @fastify/express v4.0.5 or later.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | @fastify/express |
Affected:
0 , < 4.0.5
(semver)
Unaffected: 4.0.5 (semver) |
Credits
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CVE-2026-33807 (GCVE-0-2026-33807)
Vulnerability from cvelistv5 – Published: 2026-04-15 09:52 – Updated: 2026-04-15 13:09
VLAI
Title
@fastify/express vulnerable to middleware path doubling causing authentication bypass in child plugin scopes
Summary
@fastify/express v4.0.4 and earlier contains a path handling bug in the onRegister function that causes middleware paths to be doubled when inherited by child plugins. When a child plugin is registered with a prefix that matches a middleware path, the middleware path is prefixed a second time, causing it to never match incoming requests. This results in complete bypass of Express middleware security controls, including authentication, authorization, and rate limiting, for all routes defined within affected child plugin scopes. No special configuration or request crafting is required.
Upgrade to @fastify/express v4.0.5 or later.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | @fastify/express |
Affected:
0 , < 4.0.5
(semver)
Unaffected: 4.0.5 (semver) |
Credits
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CVE-2026-33808 (GCVE-0-2026-33808)
Vulnerability from cvelistv5 – Published: 2026-04-15 09:29 – Updated: 2026-04-15 13:10
VLAI
Title
@fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)
Summary
Impact@fastify/express v4.0.4 and earlier fails to normalize URLs before passing them to Express middleware when Fastify router normalization options are enabled. This allows complete bypass of path-scoped authentication middleware via duplicate slashes when ignoreDuplicateSlashes is enabled, or via semicolon delimiters when useSemicolonDelimiter is enabled. In both cases, Fastify router normalizes the URL and matches the route, but @fastify/express passes the original un-normalized URL to Express middleware, which fails to match and is skipped. An unauthenticated attacker can access protected routes by manipulating the URL path.
PatchesUpgrade to @fastify/express v4.0.5 or later.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| fastify | @fastify/express |
Affected:
0 , < 4.0.5
(semver)
Unaffected: 4.0.5 (semver) |
Credits
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"url": "https://cna.openjsf.org/security-advisories.html"
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"title": "@fastify/express vulnerable to middleware authentication bypass via URL normalization gaps (duplicate slashes and semicolons)",
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