CVE-2026-6253— proxy credentials leak over redirect-to proxy
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I. Basic Information for CVE-2026-6253
Vulnerability Information
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Vulnerability Title
proxy credentials leak over redirect-to proxy
Source: NVD (National Vulnerability Database)
Vulnerability Description
curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. while using the first proxy (using say `http://`), curl is asked to follow a redirect to a URL using another scheme (say `https://`), accessed using a second, different, proxy
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
curl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是cURL开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl存在安全漏洞，该漏洞源于代理凭证传递错误，可能导致第一个代理的凭证被错误传递给第二个代理。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-6253
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Same Patch Batch · curl · 2026-05-13 · 8 CVEs total
| CVE-2026-7168 | cross-proxy Digest auth state leak | |
| CVE-2026-7009 | OCSP stapling bypass with Apple SecTrust | |
| CVE-2026-6429 | netrc credential leak with reused proxy connection | |
| CVE-2026-6276 | stale custom cookie host causes cookie leak | |
| CVE-2026-4873 | connection reuse ignores TLS requirement | |
| CVE-2026-5545 | wrong reuse of HTTP Negotiate connection | |
| CVE-2026-5773 | wrong reuse of SMB connection |
IV. Related Vulnerabilities
V. Comments for CVE-2026-6253
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