What is CVE-2026-91143?

CVE-2026-91143 is a high-severity vulnerability in Snail007 Goproxy, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 7.2/10. Published 2026-09-14.

How severe is CVE-2026-91143?

High severity. CVSS v3 base score is 7.2 out of 10.

Vulnerability in Snail007 Goproxy

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.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Snail007 Goproxy

Weakness classification (CWE)

CWE-288 — Authentication Bypass Using an Alternate Path or Channel

References

disclosure@vulncheck.com (exploit, third-party-advisory)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-91143?: CVE-2026-91143 is a high-severity vulnerability in Snail007 Goproxy, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 7.2/10. Published 2026-09-14.
How severe is CVE-2026-91143?: High severity. CVSS v3 base score is 7.2 out of 10.