# Fastify Reply-From vulnerabilities

Source: https://junglewise.ai/threats/technologies/reply-from  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/reply-from.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 4 vulnerabilities in Fastify Reply-From: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-16158, was published on 18 July 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 4 (0 critical, 0 exploited in the wild)

## About Fastify Reply-From

Fastify plugin that sets the reply-from HTTP header in responses.

## Latest Fastify Reply-From vulnerabilities

- [CVE-2026-16158: Fastify @fastify/reply-from cross-upstream request routing via cache collision](https://junglewise.ai/threats/cve-2026-16158-fastify-fastify-reply-from-cross-upstream-request-routing-via) (high, CVSS 8.7, published 18 Jul 2026)
- [CVE-2026-33805: Fastify proxy components header stripping via Connection header abuse](https://junglewise.ai/threats/cve-2026-33805-fastify-proxy-components-header-stripping-via-connection-header) (high, CVSS 8.6, published 15 Apr 2026)
- [CVE-2025-66415: Fastify reply-from route bypass using path traversal](https://junglewise.ai/threats/cve-2025-66415-fastify-fastify-reply-from-reply-forwarding-bypass) (medium, CVSS 5.4, published 1 Dec 2025)
- [CVE-2023-51701: @fastify/reply-from JSON Content-Type parsing confusion](https://junglewise.ai/threats/cve-2023-51701-fastify-reply-from-json-content-type-parsing-confusion) (low, CVSS 3.1, published 8 Jan 2024)

## Most severe Fastify Reply-From vulnerabilities

- [CVE-2026-16158: Fastify @fastify/reply-from cross-upstream request routing via cache collision](https://junglewise.ai/threats/cve-2026-16158-fastify-fastify-reply-from-cross-upstream-request-routing-via) (high, CVSS 8.7, published 18 Jul 2026)
- [CVE-2026-33805: Fastify proxy components header stripping via Connection header abuse](https://junglewise.ai/threats/cve-2026-33805-fastify-proxy-components-header-stripping-via-connection-header) (high, CVSS 8.6, published 15 Apr 2026)
- [CVE-2025-66415: Fastify reply-from route bypass using path traversal](https://junglewise.ai/threats/cve-2025-66415-fastify-fastify-reply-from-reply-forwarding-bypass) (medium, CVSS 5.4, published 1 Dec 2025)
- [CVE-2023-51701: @fastify/reply-from JSON Content-Type parsing confusion](https://junglewise.ai/threats/cve-2023-51701-fastify-reply-from-json-content-type-parsing-confusion) (low, CVSS 3.1, published 8 Jan 2024)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Fastify technologies

- [Fastify-Express](https://junglewise.ai/threats/technologies/express): 9 vulnerabilities
- [Fastify Http-Proxy](https://junglewise.ai/threats/technologies/http-proxy): 7 vulnerabilities
- [Fastify Middie](https://junglewise.ai/threats/technologies/middie): 7 vulnerabilities
- [Fastify Multipart](https://junglewise.ai/threats/technologies/multipart): 4 vulnerabilities
- [Fastify-Static](https://junglewise.ai/threats/technologies/static): 4 vulnerabilities
- [Fastify Busboy](https://junglewise.ai/threats/technologies/busboy): 3 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Fastify Reply-From vulnerabilities", https://junglewise.ai/threats/technologies/reply-from, 9 November 2026.