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138 vulnerabilities by fastify
CVE-2026-84428 (GCVE-0-2026-84428)
Vulnerability from nvd – Published: 2026-09-04 10:24 – Updated: 2026-09-04 16:06
VLAI
EPSS
VEX
Title
fastify vulnerable to header validation bypass via incomplete schema case normalization
Summary
fastify versions before 5.12.2 implement the case-insensitive nature of HTTP header names by lowercasing names in a route's header schema before compiling it, but the transformation is incomplete: it lowercases the properties keys and the root-level required array, and does not lowercase the trigger and dependent names inside the JSON Schema Draft 7 dependencies keyword. Because Node stores request header names in lowercase, a canonical-case dependency such as requiring an authentication header whenever a privileged-mode header is present never matches, and the presence assertion is silently skipped. An unauthenticated remote client can therefore send the header that activates a privileged branch while omitting the header the dependency was meant to require, bypassing the conditional check. Users should upgrade to fastify 5.12.2 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 16:04 UTC
CWE
- CWE-178 - Improper Handling of Case Sensitivity
Assigner
References
Impacted products
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CVE-2026-84504 (GCVE-0-2026-84504)
Vulnerability from nvd – Published: 2026-09-04 09:40 – Updated: 2026-09-04 16:34
VLAI
EPSS
VEX
Title
fastify vulnerable to request body replacement via an async validation result collision
Summary
fastify versions before 5.12.2 treat the object resolved by a successful Ajv async validator as the value result protocol used by custom validator compilers. If a request that passes its route schema contains a property named value at the root, fastify replaces the entire request body with that property's value before the handler runs, so the handler receives a different object than the one that satisfied the schema. An authenticated low-privilege caller can use this to make nested data replace the validated body and trigger an operation the route schema did not authorize, leading to unauthorized state changes and data disclosure. Users should upgrade to fastify 5.12.2 or later.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 16:34 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
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CVE-2026-84469 (GCVE-0-2026-84469)
Vulnerability from nvd – Published: 2026-09-04 09:59 – Updated: 2026-09-04 19:34
VLAI
EPSS
VEX
Title
fastify vulnerable to request validation bypass via skipped boolean false schemas
Summary
fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance. When an application assigns false to a route's body, querystring, params, or headers schema to deny all input, fastify treats it as a missing schema, compiles no validator, and runs the route handler on any request. An unauthenticated remote client can therefore reach a handler that a valid deny-all schema was intended to make unreachable, a complete validation bypass that can lead to unauthorized state changes or execution of disabled operations. Users should upgrade to fastify 5.12.2 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 19:34 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
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CVE-2026-76169 (GCVE-0-2026-76169)
Vulnerability from nvd – Published: 2026-09-04 09:51 – Updated: 2026-09-04 16:20
VLAI
EPSS
VEX
Title
fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers
Summary
fastify versions >= 4.0.0 and before 5.12.2 can route a malformed URL sent under one plugin prefix to the custom not-found handler of a different sibling plugin, and invoke it without the preHandler hook declared for that handler. The internal not-found router for encapsulated handlers dispatches malformed paths through a single shared handler pointer before URL decoding, ignoring the prefix and skipping the selected handler's normal lifecycle. An unauthenticated attacker can therefore reach an authentication-protected private fallback through an unrelated public prefix and read its full response, bypassing the authentication hook and breaking prefix encapsulation. Users should upgrade to fastify 5.12.2 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 16:18 UTC
CWE
- CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
References
Impacted products
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CVE-2026-85124 (GCVE-0-2026-85124)
Vulnerability from nvd – Published: 2026-09-03 10:51 – Updated: 2026-09-03 12:32
VLAI
EPSS
VEX
Title
@fastify/http-proxy vulnerable to prefix escape via backslash dot-segments
Summary
@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 library only rejects forward-slash traversal, so a request containing backslash dot-segments can escape the boundary set by the prefix and rewritePrefix options. An unauthenticated network attacker can use this to reach upstream paths that were meant to stay hidden behind the proxy, resulting in disclosure of internal endpoints. This is a path traversal issue (CWE-22). Users should upgrade to @fastify/http-proxy 11.6.2 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 12:31 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/http-proxy | @fastify/http-proxy |
Affected:
0 , < 11.6.2
(semver)
Unaffected: 11.6.2 (semver) |
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CVE-2026-74866 (GCVE-0-2026-74866)
Vulnerability from nvd – Published: 2026-08-21 08:20 – Updated: 2026-08-21 12:37
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name
Summary
@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 the parsed Content-Disposition filename and field name handed to the application. An attacker who uploads a file whose filename or field name contains a bare carriage return or line feed can inject control characters into consumers that trust the parser to return clean values, enabling filesystem filename pollution, log forging, or header injection when the value is forwarded to a carriage-return-sensitive sink. All versions of @fastify/busboy up to and including 3.2.1 are affected. The issue is fixed in version 3.2.2, which rejects any header line that still contains a bare carriage return or line feed. Users should upgrade to 3.2.2, and consumers such as @fastify/multipart should bump their @fastify/busboy dependency to pull in the fix.
Severity
5.8 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 12:35 UTC
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
0 , < 3.2.2
(semver)
Unaffected: 3.2.2 (semver) |
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CVE-2026-18504 (GCVE-0-2026-18504)
Vulnerability from nvd – Published: 2026-08-18 20:19 – Updated: 2026-08-19 13:15
VLAI
EPSS
VEX
Title
fastify vulnerable to schema validation bypass via root primitive coercion mismatch
Summary
fastify is a fast and low overhead web framework for Node.js. Versions of fastify before 5.12.1 are affected by a schema validation bypass when a request body schema targets a root primitive value. When the schema validates a top-level primitive such as an integer, Ajv can coerce a JSON string into the expected type during validation, but Fastify does not replace the root request body with the coerced value, so the route handler receives the original unvalidated string. As a result, a request that should have failed validation can reach application logic with a value that does not satisfy the schema, which can undermine integrity and access-control checks that rely on the validated type. Users should upgrade to fastify 5.12.1, which fixes the mismatch. No known workarounds are available.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 13:14 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
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CVE-2026-16732 (GCVE-0-2026-16732)
Vulnerability from nvd – Published: 2026-08-18 20:30 – Updated: 2026-08-19 13:16
VLAI
EPSS
VEX
Title
fastify vulnerable to X-Forwarded-* spoofing under trustProxy hop-count
Summary
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 forms of trustProxy correctly, because those forms compile to predicates that inspect the connecting address. The hop-count form, where trustProxy is set to a number, compiles to a predicate that structurally ignores the address, so the guard is always satisfied for any hop count of one or more. Applications configured with a numeric trustProxy value, such as trustProxy set to 1 for a single reverse proxy, remain vulnerable: an attacker who can reach the Fastify origin directly, bypassing the front-facing proxy, can spoof the forwarded request fields exactly as in the unpatched version. The impact class matches the parent CVE-2026-3635, including host injection in generated URLs, HTTPS-enforcement bypass, secure-cookie and CSRF-origin bypass, and host-based routing and cache poisoning. Affected versions are fastify from 5.8.3 up to but not including 5.12.1. Patches: patched in fastify 5.12.1, where the numeric form of trustProxy is disabled at runtime and removed from the TypeScript type union. Workarounds: migrate to an IP, CIDR, or custom-function trustProxy value that validates the connecting address, and ensure the Fastify origin is only reachable through the trusted proxy chain.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 13:15 UTC
CWE
- CWE-348 - Use of Less Trusted Source
Assigner
References
Impacted products
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CVE-2026-19474 (GCVE-0-2026-19474)
Vulnerability from nvd – Published: 2026-08-15 13:36 – Updated: 2026-08-17 19:43
VLAI
EPSS
VEX
Title
@fastify/multipart vulnerable to Denial of Service via temporary file leak on aborted upload
Summary
@fastify/multipart is a multipart form-data parser for Fastify. In versions from 3.0.0 up to but not including 10.1.1, request.saveRequestFiles() can leave completed temporary files on disk when a client disconnects while the parser is advancing between multipart parts. The iterator rejection that occurs between parts falls outside the per-file cleanup path, so an earlier completed file is never removed. An unauthenticated client can repeat this to cause persistent, linear disk consumption, leading to denial of service. This is an incomplete-fix variant of CVE-2025-24033. The issue is fixed in @fastify/multipart 10.1.1. Users should upgrade to 10.1.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:43 UTC
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/multipart | @fastify/multipart |
Affected:
3.0.0 , < 10.1.1
(semver)
Unaffected: 10.1.1 (semver) |
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CVE-2026-18549 (GCVE-0-2026-18549)
Vulnerability from nvd – Published: 2026-08-15 13:26 – Updated: 2026-08-17 19:44
VLAI
EPSS
VEX
Title
@fastify/multipart vulnerable to Denial of Service via aborted upload after fileSize limit
Summary
@fastify/multipart is a multipart form-data parser for Fastify. In versions from 5.3.0 up to but not including 10.1.1, when the busboy fileSize limit truncates a file part, the plugin clears its internal current-file reference while the underlying stream is still open. If the client then aborts the connection before sending the terminating boundary, the abort cleanup finds no stream to destroy, so saveRequestFiles() never settles, the request handler hangs, and the temporary file already written to disk is never cleaned up. An unauthenticated client can repeat this to permanently leak temporary files and suspended handler executions, leading to disk and event-loop exhaustion. The issue is fixed in @fastify/multipart 10.1.1. Users should upgrade to 10.1.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:43 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/multipart | @fastify/multipart |
Affected:
5.3.0 , < 10.1.1
(semver)
Unaffected: 10.1.1 (semver) |
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CVE-2026-18500 (GCVE-0-2026-18500)
Vulnerability from nvd – Published: 2026-08-15 13:16 – Updated: 2026-08-17 19:45
VLAI
EPSS
VEX
Title
@fastify/jwt vulnerable to authorization bypass via global secret overriding the per-request key
Summary
@fastify/jwt is a JSON Web Token plugin for Fastify. In versions before 10.2.2, a per-request verification key passed to request.jwtVerify({ key }) is silently overridden by the plugin's globally configured secret, because the option merge applies the global key last. Applications that use different keys for different authorization domains, for example separate user and admin keys, therefore accept a token signed with the global key on a route that explicitly requires another key. This lets an ordinary authenticated user cross a key-based trust boundary without knowing either secret. The issue is fixed in @fastify/jwt 10.2.2, where an explicit per-call key takes precedence over the global secret. Users should upgrade to 10.2.2.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:45 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/jwt | @fastify/jwt |
Affected:
0 , < 10.2.2
(semver)
Unaffected: 10.2.2 (semver) |
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CVE-2026-18165 (GCVE-0-2026-18165)
Vulnerability from nvd – Published: 2026-08-15 13:45 – Updated: 2026-08-17 19:41
VLAI
EPSS
VEX
Title
@fastify/oauth2 vulnerable to Login CSRF via plantable OAuth state cookies
Summary
@fastify/oauth2 is an OAuth 2.0 plugin for Fastify. In versions from 7.2.0 up to but not including 8.3.0, the plugin validates the OAuth state, and with PKCE the code verifier, by comparing the callback query parameter against an unprefixed, predictable cookie, with no server-side binding to the browser that began the flow. Any party able to write a cookie for the application's host, such as a sibling subdomain under the same registrable domain, can plant matching state and verifier cookies and complete an attacker-owned OAuth flow inside a victim's browser, silently signing the victim in to the attacker's account (login CSRF). It does not expose the victim's own account, credentials, or tokens. The issue is fixed in @fastify/oauth2 8.3.0, which adds an opt-in hostPrefixedCookies option. Users should upgrade to 8.3.0 and enable it, or bind state to a server-side session.
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:41 UTC
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/oauth2 | @fastify/oauth2 |
Affected:
7.2.0 , < 8.3.0
(semver)
Unaffected: 8.3.0 (semver) |
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CVE-2026-19484 (GCVE-0-2026-19484)
Vulnerability from nvd – Published: 2026-08-13 08:50 – Updated: 2026-08-13 14:27
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary
Summary
@fastify/busboy is a multipart form-data parser. In versions 3.1.0 through 3.2.0, a remote unauthenticated attacker can stall the Node.js event loop by sending a multipart request whose boundary is crafted to a specific length. The vendored streaming search stores its skip table in a fixed 256 entry byte array, and a boundary of exactly 252 bytes makes the search needle 256 bytes, which truncates the default skip distance to zero and turns the search into a CPU bound loop on a small body. A single small request can keep one core busy and deny service to other requests handled by the same process. The issue is fixed in @fastify/busboy 3.2.1, which widens the skip table so the skip distance is preserved. Users should upgrade to 3.2.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:26 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
3.1.0 , < 3.2.1
(semver)
Unaffected: 3.2.1 (semver) |
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CVE-2026-19481 (GCVE-0-2026-19481)
Vulnerability from nvd – Published: 2026-08-13 08:31 – Updated: 2026-08-13 14:25
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header
Summary
@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as __proto__ or constructor. The internal header parser stores headers in a plain JavaScript object and assumes each value is an array, so an inherited property name resolves to a truthy non-array value and triggers a TypeError. In the common pipe integration the failure surfaces as an error event, but in direct write or end usage the exception is thrown synchronously and can terminate the Node.js process, causing an unauthenticated denial of service. The issue is fixed in @fastify/busboy 3.2.1, which creates the header object with a null prototype. Users should upgrade to 3.2.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:25 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
Impacted products
1 product
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|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
1.0.0 , < 3.2.1
(semver)
Unaffected: 3.2.1 (semver) |
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CVE-2026-18427 (GCVE-0-2026-18427)
Vulnerability from nvd – Published: 2026-08-06 14:52 – Updated: 2026-08-06 15:44
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to route guard bypass via non-canonical path segments
Summary
@fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegating to the send layer. As a result, an unauthenticated attacker could request a file protected by a route based guard using a non canonical path form that misses the guarded route yet resolves back onto the protected file, disclosing its contents. Applications that protect a subtree of the static root with a route based guard are affected, while applications relying on the allowedPath option are not. This is fixed in @fastify/static 10.1.3, which canonicalizes the pathname, including rejecting backslashes, on the path used for routing and serving.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 15:44 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
0 , < 10.1.3
(semver)
Unaffected: 10.1.3 (semver) |
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CVE-2026-84428 (GCVE-0-2026-84428)
Vulnerability from cvelistv5 – Published: 2026-09-04 10:24 – Updated: 2026-09-04 16:06
VLAI
EPSS
VEX
Title
fastify vulnerable to header validation bypass via incomplete schema case normalization
Summary
fastify versions before 5.12.2 implement the case-insensitive nature of HTTP header names by lowercasing names in a route's header schema before compiling it, but the transformation is incomplete: it lowercases the properties keys and the root-level required array, and does not lowercase the trigger and dependent names inside the JSON Schema Draft 7 dependencies keyword. Because Node stores request header names in lowercase, a canonical-case dependency such as requiring an authentication header whenever a privileged-mode header is present never matches, and the presence assertion is silently skipped. An unauthenticated remote client can therefore send the header that activates a privileged branch while omitting the header the dependency was meant to require, bypassing the conditional check. Users should upgrade to fastify 5.12.2 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 16:04 UTC
CWE
- CWE-178 - Improper Handling of Case Sensitivity
Assigner
References
Impacted products
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CVE-2026-84469 (GCVE-0-2026-84469)
Vulnerability from cvelistv5 – Published: 2026-09-04 09:59 – Updated: 2026-09-04 19:34
VLAI
EPSS
VEX
Title
fastify vulnerable to request validation bypass via skipped boolean false schemas
Summary
fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance. When an application assigns false to a route's body, querystring, params, or headers schema to deny all input, fastify treats it as a missing schema, compiles no validator, and runs the route handler on any request. An unauthenticated remote client can therefore reach a handler that a valid deny-all schema was intended to make unreachable, a complete validation bypass that can lead to unauthorized state changes or execution of disabled operations. Users should upgrade to fastify 5.12.2 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 19:34 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
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CVE-2026-76169 (GCVE-0-2026-76169)
Vulnerability from cvelistv5 – Published: 2026-09-04 09:51 – Updated: 2026-09-04 16:20
VLAI
EPSS
VEX
Title
fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers
Summary
fastify versions >= 4.0.0 and before 5.12.2 can route a malformed URL sent under one plugin prefix to the custom not-found handler of a different sibling plugin, and invoke it without the preHandler hook declared for that handler. The internal not-found router for encapsulated handlers dispatches malformed paths through a single shared handler pointer before URL decoding, ignoring the prefix and skipping the selected handler's normal lifecycle. An unauthenticated attacker can therefore reach an authentication-protected private fallback through an unrelated public prefix and read its full response, bypassing the authentication hook and breaking prefix encapsulation. Users should upgrade to fastify 5.12.2 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 16:18 UTC
CWE
- CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
References
Impacted products
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CVE-2026-84504 (GCVE-0-2026-84504)
Vulnerability from cvelistv5 – Published: 2026-09-04 09:40 – Updated: 2026-09-04 16:34
VLAI
EPSS
VEX
Title
fastify vulnerable to request body replacement via an async validation result collision
Summary
fastify versions before 5.12.2 treat the object resolved by a successful Ajv async validator as the value result protocol used by custom validator compilers. If a request that passes its route schema contains a property named value at the root, fastify replaces the entire request body with that property's value before the handler runs, so the handler receives a different object than the one that satisfied the schema. An authenticated low-privilege caller can use this to make nested data replace the validated body and trigger an operation the route schema did not authorize, leading to unauthorized state changes and data disclosure. Users should upgrade to fastify 5.12.2 or later.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 16:34 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
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CVE-2026-85124 (GCVE-0-2026-85124)
Vulnerability from cvelistv5 – Published: 2026-09-03 10:51 – Updated: 2026-09-03 12:32
VLAI
EPSS
VEX
Title
@fastify/http-proxy vulnerable to prefix escape via backslash dot-segments
Summary
@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 library only rejects forward-slash traversal, so a request containing backslash dot-segments can escape the boundary set by the prefix and rewritePrefix options. An unauthenticated network attacker can use this to reach upstream paths that were meant to stay hidden behind the proxy, resulting in disclosure of internal endpoints. This is a path traversal issue (CWE-22). Users should upgrade to @fastify/http-proxy 11.6.2 or later.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 12:31 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/http-proxy | @fastify/http-proxy |
Affected:
0 , < 11.6.2
(semver)
Unaffected: 11.6.2 (semver) |
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CVE-2026-74866 (GCVE-0-2026-74866)
Vulnerability from cvelistv5 – Published: 2026-08-21 08:20 – Updated: 2026-08-21 12:37
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name
Summary
@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 the parsed Content-Disposition filename and field name handed to the application. An attacker who uploads a file whose filename or field name contains a bare carriage return or line feed can inject control characters into consumers that trust the parser to return clean values, enabling filesystem filename pollution, log forging, or header injection when the value is forwarded to a carriage-return-sensitive sink. All versions of @fastify/busboy up to and including 3.2.1 are affected. The issue is fixed in version 3.2.2, which rejects any header line that still contains a bare carriage return or line feed. Users should upgrade to 3.2.2, and consumers such as @fastify/multipart should bump their @fastify/busboy dependency to pull in the fix.
Severity
5.8 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 12:35 UTC
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
0 , < 3.2.2
(semver)
Unaffected: 3.2.2 (semver) |
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CVE-2026-16732 (GCVE-0-2026-16732)
Vulnerability from cvelistv5 – Published: 2026-08-18 20:30 – Updated: 2026-08-19 13:16
VLAI
EPSS
VEX
Title
fastify vulnerable to X-Forwarded-* spoofing under trustProxy hop-count
Summary
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 forms of trustProxy correctly, because those forms compile to predicates that inspect the connecting address. The hop-count form, where trustProxy is set to a number, compiles to a predicate that structurally ignores the address, so the guard is always satisfied for any hop count of one or more. Applications configured with a numeric trustProxy value, such as trustProxy set to 1 for a single reverse proxy, remain vulnerable: an attacker who can reach the Fastify origin directly, bypassing the front-facing proxy, can spoof the forwarded request fields exactly as in the unpatched version. The impact class matches the parent CVE-2026-3635, including host injection in generated URLs, HTTPS-enforcement bypass, secure-cookie and CSRF-origin bypass, and host-based routing and cache poisoning. Affected versions are fastify from 5.8.3 up to but not including 5.12.1. Patches: patched in fastify 5.12.1, where the numeric form of trustProxy is disabled at runtime and removed from the TypeScript type union. Workarounds: migrate to an IP, CIDR, or custom-function trustProxy value that validates the connecting address, and ensure the Fastify origin is only reachable through the trusted proxy chain.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 13:15 UTC
CWE
- CWE-348 - Use of Less Trusted Source
Assigner
References
Impacted products
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CVE-2026-18504 (GCVE-0-2026-18504)
Vulnerability from cvelistv5 – Published: 2026-08-18 20:19 – Updated: 2026-08-19 13:15
VLAI
EPSS
VEX
Title
fastify vulnerable to schema validation bypass via root primitive coercion mismatch
Summary
fastify is a fast and low overhead web framework for Node.js. Versions of fastify before 5.12.1 are affected by a schema validation bypass when a request body schema targets a root primitive value. When the schema validates a top-level primitive such as an integer, Ajv can coerce a JSON string into the expected type during validation, but Fastify does not replace the root request body with the coerced value, so the route handler receives the original unvalidated string. As a result, a request that should have failed validation can reach application logic with a value that does not satisfy the schema, which can undermine integrity and access-control checks that rely on the validated type. Users should upgrade to fastify 5.12.1, which fixes the mismatch. No known workarounds are available.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 13:14 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
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CVE-2026-18165 (GCVE-0-2026-18165)
Vulnerability from cvelistv5 – Published: 2026-08-15 13:45 – Updated: 2026-08-17 19:41
VLAI
EPSS
VEX
Title
@fastify/oauth2 vulnerable to Login CSRF via plantable OAuth state cookies
Summary
@fastify/oauth2 is an OAuth 2.0 plugin for Fastify. In versions from 7.2.0 up to but not including 8.3.0, the plugin validates the OAuth state, and with PKCE the code verifier, by comparing the callback query parameter against an unprefixed, predictable cookie, with no server-side binding to the browser that began the flow. Any party able to write a cookie for the application's host, such as a sibling subdomain under the same registrable domain, can plant matching state and verifier cookies and complete an attacker-owned OAuth flow inside a victim's browser, silently signing the victim in to the attacker's account (login CSRF). It does not expose the victim's own account, credentials, or tokens. The issue is fixed in @fastify/oauth2 8.3.0, which adds an opt-in hostPrefixedCookies option. Users should upgrade to 8.3.0 and enable it, or bind state to a server-side session.
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:41 UTC
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/oauth2 | @fastify/oauth2 |
Affected:
7.2.0 , < 8.3.0
(semver)
Unaffected: 8.3.0 (semver) |
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CVE-2026-19474 (GCVE-0-2026-19474)
Vulnerability from cvelistv5 – Published: 2026-08-15 13:36 – Updated: 2026-08-17 19:43
VLAI
EPSS
VEX
Title
@fastify/multipart vulnerable to Denial of Service via temporary file leak on aborted upload
Summary
@fastify/multipart is a multipart form-data parser for Fastify. In versions from 3.0.0 up to but not including 10.1.1, request.saveRequestFiles() can leave completed temporary files on disk when a client disconnects while the parser is advancing between multipart parts. The iterator rejection that occurs between parts falls outside the per-file cleanup path, so an earlier completed file is never removed. An unauthenticated client can repeat this to cause persistent, linear disk consumption, leading to denial of service. This is an incomplete-fix variant of CVE-2025-24033. The issue is fixed in @fastify/multipart 10.1.1. Users should upgrade to 10.1.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:43 UTC
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/multipart | @fastify/multipart |
Affected:
3.0.0 , < 10.1.1
(semver)
Unaffected: 10.1.1 (semver) |
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CVE-2026-18549 (GCVE-0-2026-18549)
Vulnerability from cvelistv5 – Published: 2026-08-15 13:26 – Updated: 2026-08-17 19:44
VLAI
EPSS
VEX
Title
@fastify/multipart vulnerable to Denial of Service via aborted upload after fileSize limit
Summary
@fastify/multipart is a multipart form-data parser for Fastify. In versions from 5.3.0 up to but not including 10.1.1, when the busboy fileSize limit truncates a file part, the plugin clears its internal current-file reference while the underlying stream is still open. If the client then aborts the connection before sending the terminating boundary, the abort cleanup finds no stream to destroy, so saveRequestFiles() never settles, the request handler hangs, and the temporary file already written to disk is never cleaned up. An unauthenticated client can repeat this to permanently leak temporary files and suspended handler executions, leading to disk and event-loop exhaustion. The issue is fixed in @fastify/multipart 10.1.1. Users should upgrade to 10.1.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:43 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/multipart | @fastify/multipart |
Affected:
5.3.0 , < 10.1.1
(semver)
Unaffected: 10.1.1 (semver) |
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CVE-2026-18500 (GCVE-0-2026-18500)
Vulnerability from cvelistv5 – Published: 2026-08-15 13:16 – Updated: 2026-08-17 19:45
VLAI
EPSS
VEX
Title
@fastify/jwt vulnerable to authorization bypass via global secret overriding the per-request key
Summary
@fastify/jwt is a JSON Web Token plugin for Fastify. In versions before 10.2.2, a per-request verification key passed to request.jwtVerify({ key }) is silently overridden by the plugin's globally configured secret, because the option merge applies the global key last. Applications that use different keys for different authorization domains, for example separate user and admin keys, therefore accept a token signed with the global key on a route that explicitly requires another key. This lets an ordinary authenticated user cross a key-based trust boundary without knowing either secret. The issue is fixed in @fastify/jwt 10.2.2, where an explicit per-call key takes precedence over the global secret. Users should upgrade to 10.2.2.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:45 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/jwt | @fastify/jwt |
Affected:
0 , < 10.2.2
(semver)
Unaffected: 10.2.2 (semver) |
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CVE-2026-19484 (GCVE-0-2026-19484)
Vulnerability from cvelistv5 – Published: 2026-08-13 08:50 – Updated: 2026-08-13 14:27
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary
Summary
@fastify/busboy is a multipart form-data parser. In versions 3.1.0 through 3.2.0, a remote unauthenticated attacker can stall the Node.js event loop by sending a multipart request whose boundary is crafted to a specific length. The vendored streaming search stores its skip table in a fixed 256 entry byte array, and a boundary of exactly 252 bytes makes the search needle 256 bytes, which truncates the default skip distance to zero and turns the search into a CPU bound loop on a small body. A single small request can keep one core busy and deny service to other requests handled by the same process. The issue is fixed in @fastify/busboy 3.2.1, which widens the skip table so the skip distance is preserved. Users should upgrade to 3.2.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:26 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
3.1.0 , < 3.2.1
(semver)
Unaffected: 3.2.1 (semver) |
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CVE-2026-19481 (GCVE-0-2026-19481)
Vulnerability from cvelistv5 – Published: 2026-08-13 08:31 – Updated: 2026-08-13 14:25
VLAI
EPSS
VEX
Title
@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header
Summary
@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as __proto__ or constructor. The internal header parser stores headers in a plain JavaScript object and assumes each value is an array, so an inherited property name resolves to a truthy non-array value and triggers a TypeError. In the common pipe integration the failure surfaces as an error event, but in direct write or end usage the exception is thrown synchronously and can terminate the Node.js process, causing an unauthenticated denial of service. The issue is fixed in @fastify/busboy 3.2.1, which creates the header object with a null prototype. Users should upgrade to 3.2.1.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:25 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/busboy | @fastify/busboy |
Affected:
1.0.0 , < 3.2.1
(semver)
Unaffected: 3.2.1 (semver) |
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CVE-2026-18427 (GCVE-0-2026-18427)
Vulnerability from cvelistv5 – Published: 2026-08-06 14:52 – Updated: 2026-08-06 15:44
VLAI
EPSS
VEX
Title
@fastify/static vulnerable to route guard bypass via non-canonical path segments
Summary
@fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass. The static file handler rejected only parent directory segments, but it did not canonicalize dot segments, duplicate slashes, encoded dots, or backslashes before route matching and before delegating to the send layer. As a result, an unauthenticated attacker could request a file protected by a route based guard using a non canonical path form that misses the guarded route yet resolves back onto the protected file, disclosing its contents. Applications that protect a subtree of the static root with a route based guard are affected, while applications relying on the allowedPath option are not. This is fixed in @fastify/static 10.1.3, which canonicalizes the pathname, including rejecting backslashes, on the path used for routing and serving.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 15:44 UTC
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| @fastify/static | @fastify/static |
Affected:
0 , < 10.1.3
(semver)
Unaffected: 10.1.3 (semver) |
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