Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later.
Project Subscriptions
No data.
No advisories yet.
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Wed, 15 Apr 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Fastify
Fastify fastify-http-proxy Fastify fastify-reply-from Fastify-reply-from Project Fastify-reply-from Project fastify-reply-from |
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| Vendors & Products |
Fastify
Fastify fastify-http-proxy Fastify fastify-reply-from Fastify-reply-from Project Fastify-reply-from Project fastify-reply-from |
Wed, 15 Apr 2026 13:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Wed, 15 Apr 2026 10:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | @fastify/reply-from v12.6.1 and earlier and @fastify/http-proxy v11.4.3 and earlier process the client's Connection header after the proxy has added its own headers via rewriteRequestHeaders. This allows attackers to retroactively strip proxy-added headers from upstream requests by listing them in the Connection header value. Any header added by the proxy for routing, access control, or security purposes can be selectively removed by a client. @fastify/http-proxy is also affected as it delegates to @fastify/reply-from. Upgrade to @fastify/reply-from v12.6.2 or @fastify/http-proxy v11.4.4 or later. | |
| Title | @fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers | |
| Weaknesses | CWE-644 | |
| References |
| |
| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-04-15T13:08:12.612Z
Reserved: 2026-03-23T19:48:48.714Z
Link: CVE-2026-33805
Updated: 2026-04-15T13:07:59.414Z
Status : Received
Published: 2026-04-15T11:16:34.990
Modified: 2026-04-15T14:16:15.507
Link: CVE-2026-33805
No data.
OpenCVE Enrichment
Updated: 2026-04-15T14:53:03Z