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    "aggregate_severity": {
      "text": "Moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
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        "url": "https://www.first.org/tlp/"
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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"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: reuse of connections using HTTP Negotiate\n     - debian/patches/CVE-2026-1965.patch: fix reuse of connections using\n       HTTP Negotiate and fix copy and paste url_match_auth_nego mistake.\n     - CVE-2026-1965\n   * Bearer token sent without checking auth is allowed\n     - debian/patches/CVE-2026-3783.patch: only send bearer if auth is\n       allowed.\n     - CVE-2026-3783\n   * Proxy credential reuse across different credentials\n     - debian/patches/CVE-2026-3784.patch: compare proxy credentials in\n       proxy_info_matches to prevent connection reuse with wrong auth.\n     - CVE-2026-3784",
        "title": "Details"
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        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1774260216",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1774260216"
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      "current_release_date": "2026-06-11T16:00:48Z",
      "generator": {
        "date": "2026-06-11T16:00:48Z",
        "engine": {
          "name": "pyCSAF"
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      },
      "id": "CLSA-2026:1774260216",
      "initial_release_date": "2026-03-23T10:04:46Z",
      "revision_history": [
        {
          "date": "2026-03-23T10:04:46Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-06-11T16:00:48Z",
          "number": "2",
          "summary": "Update document"
        }
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      "status": "final",
      "version": "2"
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    "title": "Fix CVE(s): CVE-2026-1965, CVE-2026-3783, CVE-2026-3784"
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        "name": "Incorrect Implementation of Authentication Algorithm"
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          "category": "description",
          "text": "libcurl can in some circumstances reuse the wrong connection when asked to do\nan Negotiate-authenticated HTTP or HTTPS request.\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\nWhen reusing a connection a range of criterion must first be met. Due to a\nlogical error in the code, a request that was issued by an application could\nwrongfully reuse an existing connection to the same server that was\nauthenticated using different credentials. One underlying reason being that\nNegotiate sometimes authenticates *connections* and not *requests*, contrary\nto how HTTP is designed to work.\nAn application that allows Negotiate authentication to a server (that responds\nwanting Negotiate) with `user1:password1` and then does another operation to\nthe same server also using Negotiate but with `user2:password2` (while the\nprevious connection is still alive) - the second request wrongly reused the\nsame connection and since it then sees that the Negotiate negotiation is\nalready made, it just sends the request over that connection thinking it uses\nthe user2 credentials when it is in fact still using the connection\nauthenticated for user1...\nThe set of authentication methods to use is set with  `CURLOPT_HTTPAUTH`.\nApplications can disable libcurl's reuse of connections and thus mitigate this\nproblem, by using one of the following libcurl options to alter how\nconnections are or are not reused: `CURLOPT_FRESH_CONNECT`,\n`CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using the\ncurl_multi API).",
          "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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          "details": "Affected",
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            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
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          "category": "impact",
          "details": "Moderate"
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        "name": "Insertion of Sensitive Information Into Sent Data"
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          "text": "When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer\nperforms a redirect to a second URL, curl could leak that token to the second\nhostname under some circumstances.\nIf the hostname that the first request is redirected to has information in the\nused .netrc file, with either of the `machine` or `default` keywords, curl\nwould pass on the bearer token set for the first host also to the second one.",
          "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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          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1774260216"
        },
        {
          "category": "none_available",
          "date": "2026-03-11T10:09:00Z",
          "details": "Affected",
          "product_ids": [
            "Debian-10:curl-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
            "Debian-10:curl-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
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            "Debian-10:libcurl4-gnutls-dev-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
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            "Debian-10:libcurl4-openssl-dev-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
            "Debian-10:libcurl4-openssl-dev-0:7.64.0-4+deb10u9+tuxcare.els2.amd64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "products": [
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            "Debian-10:libcurl3-nss-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
            "Debian-10:libcurl4-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
            "Debian-10:libcurl4-doc-0:7.64.0-4+deb10u9+tuxcare.els3.all",
            "Debian-10:libcurl4-gnutls-dev-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
            "Debian-10:libcurl4-nss-dev-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    },
    {
      "cve": "CVE-2026-3784",
      "cwe": {
        "id": "CWE-305",
        "name": "Authentication Bypass by Primary Weakness"
      },
      "notes": [
        {
          "category": "description",
          "text": "curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a\nserver, even if the new request uses different credentials for the HTTP proxy.\nThe proper behavior is to create or use a separate connection.",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
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          "Debian-10:libcurl3-nss-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
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          "Debian-10:libcurl4-nss-dev-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
          "Debian-10:libcurl4-openssl-dev-0:7.64.0-4+deb10u9+tuxcare.els3.amd64"
        ],
        "known_affected": [
          "Debian-10:curl-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
          "Debian-10:curl-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
          "Debian-10:libcurl3-gnutls-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
          "Debian-10:libcurl3-gnutls-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
          "Debian-10:libcurl3-nss-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
          "Debian-10:libcurl3-nss-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
          "Debian-10:libcurl4-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
          "Debian-10:libcurl4-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
          "Debian-10:libcurl4-doc-0:7.64.0-4+deb10u9+tuxcare.els1.all",
          "Debian-10:libcurl4-doc-0:7.64.0-4+deb10u9+tuxcare.els2.all",
          "Debian-10:libcurl4-gnutls-dev-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
          "Debian-10:libcurl4-gnutls-dev-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
          "Debian-10:libcurl4-nss-dev-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
          "Debian-10:libcurl4-nss-dev-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
          "Debian-10:libcurl4-openssl-dev-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
          "Debian-10:libcurl4-openssl-dev-0:7.64.0-4+deb10u9+tuxcare.els2.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-3784"
        }
      ],
      "release_date": "2026-03-11T11:16:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-03-23T10:03:41.053870Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1774260216",
          "product_ids": [
            "Debian-10:curl-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
            "Debian-10:libcurl3-gnutls-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
            "Debian-10:libcurl3-nss-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
            "Debian-10:libcurl4-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
            "Debian-10:libcurl4-doc-0:7.64.0-4+deb10u9+tuxcare.els3.all",
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            "Debian-10:libcurl4-nss-dev-0:7.64.0-4+deb10u9+tuxcare.els3.amd64",
            "Debian-10:libcurl4-openssl-dev-0:7.64.0-4+deb10u9+tuxcare.els3.amd64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1774260216"
        },
        {
          "category": "none_available",
          "date": "2026-03-11T11:16:00Z",
          "details": "Affected",
          "product_ids": [
            "Debian-10:curl-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
            "Debian-10:curl-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
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            "Debian-10:libcurl3-nss-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
            "Debian-10:libcurl3-nss-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
            "Debian-10:libcurl4-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
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            "Debian-10:libcurl4-gnutls-dev-0:7.64.0-4+deb10u9+tuxcare.els1.amd64",
            "Debian-10:libcurl4-gnutls-dev-0:7.64.0-4+deb10u9+tuxcare.els2.amd64",
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          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
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          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}