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@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

Immutable source observations

7 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

1 Nov 2026 05:16:03 UTC

@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 pro…

euvd · EUVD-2026-22877 · Published

30 Oct 2026 05:00:13 UTC

@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 pro…

euvd · EUVD-2026-22877 · Published

28 Oct 2026 04:02:00 UTC

@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 pro…

euvd · EUVD-2026-22877 · Published

27 Oct 2026 09:02:55 UTC

@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 pro…

nvd · CVE-2026-33805 · Published

25 Oct 2026 08:17:24 UTC

@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 pro…

nvd · CVE-2026-33805 · Published

24 Oct 2026 13:17:17 UTC

Fastify's connection header abuse enables stripping of proxy-added headers

osv · GHSA-gwhp-pf74-vj37 · Published

23 Oct 2026 15:48:27 UTC

@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headers

cve-program · CVE-2026-33805 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 1 Nov 12:00 UTC · 274 of 275 readable · 269 fully read · documentation 469/469 current