CVE-2026-91143

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.

References

https://www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connect

https://github.com/snail007/goproxy/blob/v15.3/utils/structs.go

https://github.com/snail007/goproxy/blob/v15.3/services/http.go

https://github.com/snail007/goproxy

https://github.com/geo-chen/oss/blob/main/goproxy.md

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-78166

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS