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CVE-2026-91143

goproxy through 15.3 Authentication Bypass via CONNECT

CVSS 4.0 6.9 MEDIUMCVSS 3.1 7.2 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91143

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91143

Published

goproxy

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "snail007",
                    "product": "goproxy",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:golang/github.com/snail007/goproxy",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "15.3",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ],
                    "repo": "https://github.com/snail007/goproxy"
                }

Original source record · Cite this exact observation · Complete original publisher JSON