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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://github.com/geo-chen/oss/blob/main/goproxy.md
- https://github.com/snail007/goproxy
- https://github.com/snail007/goproxy/blob/v15.3/services/http.go
- https://github.com/snail007/goproxy/blob/v15.3/utils/structs.go
- https://www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connect
CWEs
CWE-288
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.