CVE-2026-91143goproxy through 15.3 Authentication Bypass via CONNECT
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No exploitation reported and no EPSS estimate yet.
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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
- 7.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-288
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
snail007 goproxy snail007:goproxy (from the name) | through 15.3 | CNA record |
References
- https://github.com/geo-chen/oss/blob/main/goproxy.mdthird-party-advisory, exploit
- https://github.com/snail007/goproxy/blob/v15.3/utils/structs.gotechnical-description
- https://github.com/snail007/goproxy/blob/v15.3/services/http.gotechnical-description
- https://github.com/snail007/goproxyproduct
- https://www.vulncheck.com/advisories/goproxy-through-15.3-authentication-bypass-via-connectthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.