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10 vulnerabilities found for fastify by fastify
CVE-2026-16732 (GCVE-0-2026-16732)
Vulnerability from cvelistv5
Published
2026-08-18 20:30
Modified
2026-08-19 13:16
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-348 - Use of Less Trusted Source
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.
References
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CVE-2026-18504 (GCVE-0-2026-18504)
Vulnerability from cvelistv5
Published
2026-08-18 20:19
Modified
2026-08-19 13:15
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-20 - Improper Input Validation
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.
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CVE-2026-33806 (GCVE-0-2026-33806)
Vulnerability from cvelistv5
Published
2026-04-15 00:14
Modified
2026-07-15 01:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1287 - Improper Validation of Specified Type of Input
Summary
Impact:
Fastify applications using schema.body.content for per-content-type body validation can have validation bypassed entirely by prepending a space to the Content-Type header. The body is still parsed correctly but schema validation is skipped.
This is a regression introduced in fastify >= 5.3.2 by the fix for CVE-2025-32442
Patches:
Upgrade to fastify v5.8.5 or later.
Workarounds:
None. Upgrade to the patched version.
References
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CVE-2026-3635 (GCVE-0-2026-3635)
Vulnerability from cvelistv5
Published
2026-03-23 13:53
Modified
2026-03-23 15:30
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-348 - Use of less trusted source
Summary
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 connections from untrusted IPs. This allows an attacker connecting directly to Fastify (bypassing the proxy) to spoof both the protocol and host seen by the application.
Affected Versions
fastify <= 5.8.2
Impact
Applications using request.protocol or request.host for security decisions (HTTPS enforcement, secure cookie flags, CSRF origin checks, URL construction, host-based routing) are affected when trustProxy is configured with a restrictive trust function.
When trustProxy: true (trust everything), both host and protocol trust all forwarded headers — this is expected behavior. The vulnerability only manifests with restrictive trust configurations.
References
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CVE-2026-3419 (GCVE-0-2026-3419)
Vulnerability from cvelistv5
Published
2026-03-06 17:50
Modified
2026-03-09 14:55
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-185 - Incorrect Regular Expression
Summary
Fastify incorrectly accepts malformed `Content-Type` headers containing trailing characters after the subtype token, in violation of RFC 9110 §8.3.1(https://httpwg.org/specs/rfc9110.html#field.content-type). For example, a request sent with Content-Type: application/json garbage passes validation and is processed normally, rather than being rejected with 415 Unsupported Media Type.
When regex-based content-type parsers are in use (a documented Fastify feature), the malformed value is matched against registered parsers using the full string including the trailing garbage. This means a request with an invalid content-type may be routed to and processed by a parser it should never have reached.
Impact:
An attacker can send requests with RFC-invalid Content-Type headers that bypass validity checks, reach content-type parser matching, and be processed by the server. Requests that should be rejected at the validation stage are instead handled as if the content-type were valid.
Workarounds:
Deploy a WAF rule to protect against this
Fix:
The fix is available starting with v5.8.1.
References
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CVE-2026-25223 (GCVE-0-2026-25223)
Vulnerability from cvelistv5
Published
2026-02-03 21:21
Modified
2026-07-15 01:16
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-436 - Interpretation Conflict
Summary
Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.2, a validation bypass vulnerability exists in Fastify where request body validation schemas specified by Content-Type can be completely circumvented. By appending a tab character (\t) followed by arbitrary content to the Content-Type header, attackers can bypass body validation while the server still processes the body as the original content type. This issue has been patched in version 5.7.2.
References
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CVE-2026-25224 (GCVE-0-2026-25224)
Vulnerability from cvelistv5
Published
2026-02-03 21:21
Modified
2026-02-04 16:20
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.3, a denial-of-service vulnerability in Fastify’s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream (or Response with a Web Stream body) via reply.send() are impacted. A slow or non-reading client can trigger unbounded buffering when backpressure is ignored, leading to process crashes or severe degradation. This issue has been patched in version 5.7.3.
References
| URL | Tags | ||||||||||
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CVE-2025-32442 (GCVE-0-2025-32442)
Vulnerability from cvelistv5
Published
2025-04-18 15:59
Modified
2025-08-22 20:50
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1287 - Improper Validation of Specified Type of Input
Summary
Fastify is a fast and low overhead web framework, for Node.js. In versions 5.0.0 to 5.3.0 as well as version 4.29.0, applications that specify different validation strategies for different content types have a possibility to bypass validation by providing a _slightly altered_ content type such as with different casing or altered whitespacing before `;`. This was patched in v5.3.1, but the initial patch did not cover all problems. This has been fully patched in v5.3.2 and v4.29.1. A workaround involves not specifying individual content types in the schema.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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Impacted products
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CVE-2022-41919 (GCVE-0-2022-41919)
Vulnerability from cvelistv5
Published
2022-11-22 00:00
Modified
2025-04-23 16:36
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Summary
Fastify is a web framework with minimal overhead and plugin architecture. The attacker can use the incorrect `Content-Type` to bypass the `Pre-Flight` checking of `fetch`. `fetch()` requests with Content-Type’s essence as "application/x-www-form-urlencoded", "multipart/form-data", or "text/plain", could potentially be used to invoke routes that only accepts `application/json` content type, thus bypassing any CORS protection, and therefore they could lead to a Cross-Site Request Forgery attack. This issue has been patched in version 4.10.2 and 3.29.4. As a workaround, implement Cross-Site Request Forgery protection using `@fastify/csrf'.
References
Impacted products
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CVE-2022-39288 (GCVE-0-2022-39288)
Vulnerability from cvelistv5
Published
2022-10-10 00:00
Modified
2025-04-23 16:51
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Summary
fastify is a fast and low overhead web framework, for Node.js. Affected versions of fastify are subject to a denial of service via malicious use of the Content-Type header. An attacker can send an invalid Content-Type header that can cause the application to crash. This issue has been addressed in commit `fbb07e8d` and will be included in release version 4.8.1. Users are advised to upgrade. Users unable to upgrade may manually filter out http content with malicious Content-Type headers.
References
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