CVE-2026-91143
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.
Published:Sep 14, 2026
Last Modified:Sep 17, 2026
EPS:Sep 14, 2026
EPSS Score:0.00268
CVSS Score:7.2
Affected Products
Vendor
Product
Action
Vendor
Goproxy Project
Product
Goproxy
Goproxy Project
Goproxy
Vendor
Snail007
Product
Goproxy
Snail007
Goproxy
Exploits
No exploit reference
Common Weakness Enumeration
Common Attack Pattern Enumeration and Classification (CAPEC)
References
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
