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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (40.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/geo-chen/oss/blob/main/goproxy.md (exploit, third-party-advisory)
- github.com/snail007/goproxy/blob/v15.3/utils/structs.go (technical-description)
- github.com/snail007/goproxy/blob/v15.3/services/http.go (technical-description)
- github.com/snail007/goproxy (product)
- www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-con… (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.