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      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "name": "Insertion of Sensitive Information Into Sent Data"
      },
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in curl. When curl is configured to use distinct proxies for different URL schemes, a redirect from a URL using an authenticated proxy to one using an unauthenticated proxy can inadvertently expose the initial proxy's credentials. This improper credential management (CWE-522) may allow an attacker to gain unauthorized access or information by intercepting these disclosed credentials.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-6253"
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      "release_date": "2026-05-13T13:01:00Z",
      "remediations": [
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          "category": "no_fix_planned",
          "date": "2026-07-28T12:00:54.688003Z",
          "details": "This issue only triggers when automatic redirect following is enabled (e.g., -L or CURLOPT_FOLLOWLOCATION) and curl is explicitly configured with different proxies per URL scheme such that an authenticated first proxy is used, a cross‑scheme redirect occurs, and a different second proxy without authentication is selected; using a single proxy or not following redirects prevents it outright. When it does occur, the impact is limited to disclosure of the first proxy’s Basic credentials to the second proxy—no code execution, integrity change, or service availability impact. Given these narrow, opt‑in prerequisites and the confidentiality‑only effect against a secondary proxy endpoint, this is a low‑priority concern for typical enterprise VM/server deployments.",
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            "baseScore": 5.3,
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
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