@fastify/http-proxy vulnerable to prefix escape via WebSocket path traversal
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
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| @fastify/http-proxy | @fastify/http-proxy | unaffected |
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No data.
| Vendor | Product | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fastify | Fastify-http-proxy |
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No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.501% probability within 30 days)
| Type | Values Removed | Values Added |
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| First Time appeared |
Fastify
Fastify fastify-http-proxy |
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| Vendors & Products |
Fastify
Fastify fastify-http-proxy |
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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| Description | Impact: @fastify/http-proxy versions from 9.4.0 up to and including 11.5.0 fail to validate the resolved WebSocket destination path against the configured rewrite prefix. The WebSocket routing path in WebSocketProxy.findUpstream resolves the destination via the WHATWG URL constructor, which collapses dot segments, so a crafted upgrade request with path traversal sequences can escape the rewrite prefix and reach upstream endpoints that were not meant to be exposed by the proxy. This is a variant of CVE-2021-21322 in a code path that never went through the HTTP fix in fastify/reply-from. Exploitation requires a non-normalizing WebSocket client, since browsers and the ws package normalize the request path before sending, but raw HTTP clients or downstream proxies that forward the request target unchanged make the attack reachable in production topologies. Patches: upgrade to @fastify/http-proxy 11.6.0. Workarounds: none. | |
| Title | @fastify/http-proxy vulnerable to prefix escape via WebSocket path traversal | |
| Weaknesses | CWE-22 | |
| References |
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| Metrics |
cvssV3_1
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