CVE-2025-66415

fastify-reply-from bypass of reply forwarding

Published Dec 1, 2025 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. Prior to 12.5.0, by crafting a malicious URL, an attacker could access routes that are not allowed, even though the reply.from is defined for specific routes in @fastify/reply-from. This vulnerability is fixed in 12.5.0.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-2q7r-29rg-6m5h fastify-reply-from affected by bypass of reply forwarding
History
Type Values Removed Values Added
CPEs cpe:2.3:a:fastify:reply-from:*:*:*:*:*:node.js:*:*
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'}

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

threat_severity

Moderate

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Fastify
Fastify reply-from
Vendors & Products Fastify
Fastify reply-from
Type Values Removed Values Added
Description fastify-reply-from is a Fastify plugin to forward the current HTTP request to another server. Prior to 12.5.0, by crafting a malicious URL, an attacker could access routes that are not allowed, even though the reply.from is defined for specific routes in @fastify/reply-from. This vulnerability is fixed in 12.5.0.
Title fastify-reply-from bypass of reply forwarding
Weaknesses CWE-441
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 2, 2025, 2:13 PM
Reserved
Nov 28, 2025, 11:33 PM
Status
Analyzed
Published
Dec 1, 2025, 11:15 PM
Modified
Oct 18, 2026, 6:10 PM
Severity
Moderate
Public date
Dec 1, 2025, 10:39 PM