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CVE-2026-91143— goproxy through 15.3 Authentication Bypass via CONNECT

Quick assessment

Affected
snail007 goproxy
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.

goproxy 版本 15.3 及更早版本未能对通过 HTTP 代理的 CONNECT 隧道请求应用基本的身份验证机制，使得未经身份验证的客户端可以绕过凭据要求。攻击者可以发出 CONNECT 请求，通过已认证的代理建立隧道而无需提供凭据，从而实现任意 TCP 流量的中继以及对受限目标地址的访问。

CVSS 7.2 · High EPSS 0.27% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
snail007 goproxy ≤ 15.3 affected
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I. Basic Information for CVE-2026-91143

Vulnerability Information
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Vulnerability Title
goproxy through 15.3 Authentication Bypass via CONNECT
Source: CVE Program / CVE List V5
Vulnerability Description
goproxy through 15.3 fails to apply HTTP proxy basic authentication to CONNECT tunnel requests, allowing unauthenticated clients to bypass credential requirements. Attackers can issue CONNECT requests to establish tunnels through the authenticated proxy without providing credentials, enabling arbitrary TCP traffic relay and access to restricted destinations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
snail007 goproxy 0 ~ 15.3 -

II. Public POCs for CVE-2026-91143

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-91143

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Patches & Fixes for CVE-2026-91143 (2)

Vendor Advisories for CVE-2026-91143 (1)

Proof of Concept for CVE-2026-91143 (1)

IV. Related Vulnerabilities

Same weakness: CWE-288

V. Comments for CVE-2026-91143

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