CVE-2026-91143
goproxy through 15.3 Authentication Bypass via CONNECT
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.
INFO
Published Date :
Sept. 14, 2026, 9:45 p.m.
Last Modified :
Sept. 14, 2026, 9:45 p.m.
Remotely Exploit :
Yes !
Source :
VulnCheck
Affected Products
The following products are affected by CVE-2026-91143
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 |
Solution
- Update go-proxy to version 15.3 or later.
- Configure HTTP proxy basic authentication for CONNECT requests.
- Validate authentication enforcement for tunnel requests.
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CVE-2026-91143 vulnerability anywhere in the article.