High severity7.2NVD Advisory· Published Sep 14, 2026

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Snail007/Goproxyreferences2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: <=15.3

Patches

Vulnerability mechanics

References

github.com/geo-chen/oss/blob/main/goproxy.mdnvd
github.com/snail007/goproxy/blob/v15.3/services/http.gonvd
github.com/snail007/goproxy/blob/v15.3/utils/structs.gonvd
www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connectnvd

News mentions

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cvss	0.468
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000