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        "text": "An update for curl is now available for Red Hat Enterprise Linux 10.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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        "text": "The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.\n\nSecurity Fix(es):\n\n* curl: libcurl: Improper certificate validation due to cached TLS settings reuse (CVE-2025-14819)\n\n* curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication (CVE-2026-1965)\n\n* curl: curl: Unauthorized access due to improper HTTP proxy connection reuse (CVE-2026-3784)\n\n* curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect (CVE-2026-3783)\n\n* curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547)\n\n* curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286)\n\n* curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP (CVE-2026-12064)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
        "title": "Details"
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        "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 Red Hat Inc. and provide a link to the original.",
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      "cve": "CVE-2026-1965",
      "cwe": {
        "id": "CWE-303",
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          "category": "description",
          "text": "A flaw was found in curl. When an application uses libcurl to make multiple Negotiate-authenticated HTTP or HTTPS requests to the same server with different credentials, libcurl may incorrectly reuse an existing connection. This logical error can cause a subsequent request to be sent using the authentication of a previous user, leading to an authentication bypass.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "category": "impact",
          "details": "Moderate"
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      "title": "curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication"
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    {
      "cve": "CVE-2026-3783",
      "cwe": {
        "id": "CWE-201",
        "name": "Insertion of Sensitive Information Into Sent Data"
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      "discovery_date": "2026-03-11T11:01:01.429907+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2446450"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in curl. When an OAuth2 bearer token is used for an HTTP(S) transfer that redirects to a second URL, curl could unintentionally leak the token. This occurs if the second hostname has entries in the `.netrc` file, allowing the bearer token intended for the first host to be sent to the redirected host. This information disclosure could allow an attacker to gain unauthorized access.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-3783"
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        {
          "category": "external",
          "summary": "RHBZ#2446450",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2446450"
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          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-3783"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-3783",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3783"
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        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/03/11/2",
          "url": "http://www.openwall.com/lists/oss-security/2026/03/11/2"
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        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-3783.html",
          "url": "https://curl.se/docs/CVE-2026-3783.html"
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          "category": "external",
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      "cve": "CVE-2026-3784",
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        "id": "CWE-305",
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          "category": "description",
          "text": "A flaw was found in curl. This vulnerability allows curl to wrongly reuse an existing HTTP proxy connection when performing a CONNECT request to a server, even if the new request uses different authentication credentials for the HTTP proxy. This improper connection reuse could lead to an attacker gaining unauthorized access to resources or information intended for a different user.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Unauthorized access due to improper HTTP proxy connection reuse",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      "cwe": {
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        "name": "Improper Certificate Validation"
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          "category": "description",
          "text": "A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security (TLS) configuration of the new transfer does not match the existing connection, potentially leading to an insecure connection being established.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Insecure connection establishment due to TLS configuration mismatch",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important flaw as `curl` may establish an insecure connection when attempting to upgrade a transfer with STARTTLS, potentially reusing an existing connection with mismatched TLS configurations. This could lead to unexpected data exposure or compromise, particularly in environments where `curl` is used for sensitive data transfers and relies on STARTTLS for security.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "category": "external",
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        "name": "Improper Verification of Cryptographic Signature"
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          "category": "description",
          "text": "A flaw was found in curl. When a libcurl-based application uses SCP:// or SFTP:// for transfers and employs the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an untrusted server. This occurs if the server\u0027s host key type differs from the one stored in the known_hosts file. The callback mechanism fails to enforce the host key restriction, enabling a connection to an untrusted server and risking a man-in-the-middle attack.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Man-in-the-middle attack via SSH host key bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important flaw where libcurl-based applications performing SCP or SFTP transfers with the CURLOPT_SSH_KEYFUNCTION callback may silently accept an untrusted server. This occurs when a server presents a host key type that differs from the one recorded in the known_hosts file, bypassing a critical host key verification and enabling potential man-in-the-middle attacks. The vulnerability requires specific application callback usage, not a general curl client default.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-9547"
        },
        {
          "category": "external",
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496758"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-9547",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-9547"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-9547",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9547"
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          "text": "A flaw was found in curl. When a user invokes curl with a schemeless URL and specifies SFTP (SSH File Transfer Protocol) or SCP (Secure Copy Protocol) as the default protocol, the tool layer fails to initialize critical SSH security options. This bypasses host verification, allowing curl to connect to an unverified SSH remote host without alerting the user. This could enable an attacker to intercept or manipulate data through a man-in-the-middle attack.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important flaw in curl allows an attacker to bypass SSH host verification when a user invokes curl with a schemeless URL and specifies SFTP or SCP as the default protocol. This can lead to man-in-the-middle attacks, enabling data interception or manipulation without user awareness in Red Hat environments.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-12064"
        },
        {
          "category": "external",
          "summary": "RHBZ#2496768",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496768"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-12064",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-12064"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-12064",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-12064"
        },
        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-12064.html",
          "url": "https://curl.se/docs/CVE-2026-12064.html"
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        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-12064.json",
          "url": "https://curl.se/docs/CVE-2026-12064.json"
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        {
          "category": "external",
          "summary": "https://hackerone.com/reports/3797526",
          "url": "https://hackerone.com/reports/3797526"
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      "release_date": "2026-07-03T06:13:55.302000+00:00",
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