Vulnerability DatabaseCVE-2026-91143
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CVE-2026-91143
Published:September 14, 2026
Updated:October 13, 2026
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.
Related Resources (7)
https://github.com/geo-chen/oss/blob/main/goproxy.md
https://github.com/snail007/goproxy/blob/v15.3/services/http.go
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91143.json
https://www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connect
https://nvd.nist.gov/vuln/detail/CVE-2026-91143
https://github.com/snail007/goproxy/blob/v15.3/utils/structs.go
https://github.com/snail007/goproxy
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Authentication Bypass Using an Alternate Path or Channel
CWE-288
EPSS
Base Score:
0.47