CVE-2026-55568— Guzzle: Silent HTTPS-Proxy Downgrade to Cleartext

Guzzle: Silent HTTPS-Proxy Downgrade to Cleartext

Guzzle is an extensible PHP HTTP client. Prior to 7.12.1, in certain configurations, traffic expected to be protected by TLS on the hop to the proxy is transmitted in cleartext. Proxy authentication credentials (the Proxy-Authorization header, proxy userinfo in the proxy URL, or CURLOPT_PROXYUSERPWD) are sent without encryption, and the CONNECT target host and port for tunneled HTTPS requests are exposed. The built-in cURL handlers (GuzzleHttp\Handler\CurlHandler and GuzzleHttp\Handler\CurlMultiHandler, used by default whenever the PHP cURL extension is available) accept an https:// proxy. libcurl older than 7.50.2 silently treats an https:// proxy as a plaintext http:// proxy. The TLS connection to the proxy is never established, and the proxy leg is cleartext with no error or warning. An application is affected when it sends requests through one of the built-in cURL handlers, configures an https:// proxy expecting the proxy connection itself to be encrypted, and runs with libcurl older than 7.50.2. This vulnerability is fixed in 7.12.1.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

敏感数据加密缺失

guzzle 加密问题漏洞

guzzle guzzle是guzzle组织的一款用于简化HTTP请求的PHP开发工具。 guzzle 7.12.1之前版本存在安全漏洞，该漏洞源于配置中TLS保护不当，导致预期受保护的代理通信以明文传输，代理认证凭据和HTTPS请求的目标信息被暴露。

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