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CVE-2026-85124— @fastify/http-proxy vulnerable to prefix escape via backslash dot-segments

Quick assessment

Affected
@fastify/http-proxy @fastify/http-proxy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fastify @fastify/http-proxy是Fastify团队的一个HTTP代理模块。 Fastify @fastify/http-proxy 11.6.2之前版本存在路径遍历漏洞，该漏洞源于未验证代理HTTP请求路径中基于反斜杠的点段，存在路径遍历问题，可能导致未经身份验证的网络攻击者访问本应隐藏的内部端点并泄露信息。

CVSS 7.5 · High EPSS 0.74% · P53

Affected Version Matrix 2

VendorProduct Version RangeStatus
@fastify/http-proxy @fastify/http-proxy < 11.6.2 affected
11.6.2 unaffected
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I. Basic Information for CVE-2026-85124

Vulnerability Information
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Vulnerability Title
@fastify/http-proxy vulnerable to prefix escape via backslash dot-segments
Source: CVE Program / CVE List V5
Vulnerability Description
@fastify/http-proxy versions before 11.6.2 do not validate proxied HTTP request paths for backslash based dot-segments before forwarding them to the configured upstream. The plain HTTP request handler skips the destination validation that the WebSocket path performs, and the underlying reply-from library only rejects forward-slash traversal, so a request containing backslash dot-segments can escape the boundary set by the prefix and rewritePrefix options. An unauthenticated network attacker can use this to reach upstream paths that were meant to stay hidden behind the proxy, resulting in disclosure of internal endpoints. This is a path traversal issue (CWE-22). Users should upgrade to @fastify/http-proxy 11.6.2 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Fastify @fastify/http-proxy 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify @fastify/http-proxy是Fastify团队的一个HTTP代理模块。 Fastify @fastify/http-proxy 11.6.2之前版本存在路径遍历漏洞，该漏洞源于未验证代理HTTP请求路径中基于反斜杠的点段，存在路径遍历问题，可能导致未经身份验证的网络攻击者访问本应隐藏的内部端点并泄露信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
@fastify/http-proxy @fastify/http-proxy 0 ~ 11.6.2 -

II. Public POCs for CVE-2026-85124

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III. Intelligence Information for CVE-2026-85124

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Vendor Advisories for CVE-2026-85124 (1)

IV. Related Vulnerabilities

Same product: @fastify/http-proxy
Same vendor: @fastify/http-proxy
Same weakness: CWE-22

V. Comments for CVE-2026-85124

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