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      "text": "TuxCare License Agreement",
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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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      "id": "CVE-2026-6253-ELS_OS-CLOUDLINUX7ELS",
      "initial_release_date": "2026-05-13T13:01:00Z",
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        {
          "date": "2026-05-13T13:01:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-08-01T22:18:50Z",
          "number": "2",
          "summary": "Official Publication"
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        {
          "date": "2026-08-03T20:10:57Z",
          "number": "3",
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      "cve": "CVE-2026-6253",
      "cwe": {
        "id": "CWE-522",
        "name": "Insufficiently Protected Credentials"
      },
      "notes": [
        {
          "category": "description",
          "text": "curl might erroneously pass on credentials for a first proxy to a second\nproxy.\n\nThis can happen when the following conditions are true:\n\n1. curl is setup to use specific different proxies for different URL schemes\n2. the first proxy needs credentials\n3. the second proxy uses no credentials\n4. while using the first proxy (using say `http://`), curl is asked to follow\n   a redirect to a URL using another scheme (say `https://`), accessed using a\n   second, different, proxy",
          "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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          "CloudLinux-7:libcurl-devel-0:7.29.0-59.0.3.el7_9.2.x86_64"
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-6253"
        },
        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-6253.html",
          "url": "https://curl.se/docs/CVE-2026-6253.html"
        },
        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-6253.json",
          "url": "https://curl.se/docs/CVE-2026-6253.json"
        },
        {
          "category": "external",
          "summary": "https://hackerone.com/reports/3669637",
          "url": "https://hackerone.com/reports/3669637"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/04/29/11",
          "url": "http://www.openwall.com/lists/oss-security/2026/04/29/11"
        }
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      "release_date": "2026-05-13T13:01:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-03T16:39:33.845456Z",
          "details": "This issue only triggers under a narrow, non-default setup: curl/libcurl must be explicitly configured with different proxies per URL scheme, the first proxy must use authentication while the second does not, and redirect-following must be enabled (e.g., -L or CURLOPT_FOLLOWLOCATION). Even then, the impact is limited to disclosure of the first proxy’s credentials to the second proxy; there is no code execution, integrity change, or availability impact. Because curl uses no proxy and does not follow redirects by default—and per‑scheme proxying exists only when deliberately configured—the practical risk in managed enterprise VM/server environments is low, so this CVE can be safely deprioritized.",
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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",
            "version": "3.1"
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