CVE-2026-91143: medium-severity vulnerability in snail007 goproxy
goproxy through 15.3 Authentication Bypass via CONNECT
Published · Updated
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33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.9epss 0.5%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Affected products
snail007 · goproxypublic PoCs found — 1
cve_referencegithub.com/geo-chen/oss/blob/main/goproxy.mdunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://github.com/geo-chen/oss/blob/main/goproxy.mdhttps://github.com/snail007/goproxyhttps://github.com/snail007/goproxy/blob/v15.3/services/http.gohttps://github.com/snail007/goproxy/blob/v15.3/utils/structs.gohttps://www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connect