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CVE-2026-91143 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:8.3 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

CNA: [email protected]CVSS-B:7.2 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/geo-chen/oss/blob/main/goproxy.md	[email protected]	ExploitTechnical Analysis
https://github.com/snail007/goproxy	[email protected]	Vendor
https://github.com/snail007/goproxy/blob/v15.3/services/http.go	[email protected]	Source CodeVendor
https://github.com/snail007/goproxy/blob/v15.3/utils/structs.go	[email protected]	Source CodeVendor
https://www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connect	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-288	Authentication Bypass Using an Alternate Path or Channel	[email protected]

Affected Products

Product	Versions
snail007 goproxy	<= 15.3
CPE No CPEs found in CPE dictionary for this product. Remediation No remediation found in references.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 15, 2026	CVE Modified	CISA-ADP
Sep 14, 2026	New CVE Received	[email protected]