fix(deps): update dependency fastify to v5.8.3 [security] - autoclosed#2095
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This PR contains the following updates:
5.7.4→5.8.3GitHub Vulnerability Alerts
CVE-2026-3419
Description
Fastify incorrectly accepts malformed
Content-Typeheaders containing trailing characters after the subtype token, in violation of RFC 9110 §8.3.1. For example, a request sent withContent-Type: application/json garbagepasses validation and is processed normally, rather than being rejected with415 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-Typeheaders 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.
CVE-2026-3635
Summary
When
trustProxyis configured with a restrictive trust function (e.g., a specific IP liketrustProxy: '10.0.0.1', a subnet, a hop count, or a custom function), therequest.protocolandrequest.hostgetters readX-Forwarded-ProtoandX-Forwarded-Hostheaders 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.protocolorrequest.hostfor security decisions (HTTPS enforcement, secure cookie flags, CSRF origin checks, URL construction, host-based routing) are affected whentrustProxyis configured with a restrictive trust function.When
trustProxy: true(trust everything), bothhostandprotocoltrust all forwarded headers — this is expected behavior. The vulnerability only manifests with restrictive trust configurations.Release Notes
fastify/fastify (fastify)
v5.8.3Compare Source
This fixes CVE CVE-2026-3635 GHSA-444r-cwp2-x5xf.
What's Changed
New Contributors
Full Changelog: fastify/fastify@v5.8.2...v5.8.3
v5.8.2Compare Source
What's Changed
New Contributors
Full Changelog: fastify/fastify@v5.8.1...v5.8.2
v5.8.1Compare Source
Fixes "Missing End Anchor in "subtypeNameReg" Allows Malformed Content-Types to Pass Validation": GHSA-573f-x89g-hqp9.
CVE-2026-3419
Full Changelog: fastify/fastify@v5.8.0...v5.8.1
v5.8.0Compare Source
What's Changed
tsconfig.eslint.jsonby @mrazauskas in #6524New Contributors
Full Changelog: fastify/fastify@v5.7.4...v5.8.0
Configuration
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