RHSA-2026:7432

Vulnerability from csaf_redhat - Published: 2026-04-10 19:17 - Updated: 2026-10-15 19:17
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: curl: * curl-8.19.0-3.1.hum1 (aarch64, x86_64) * libcurl-8.19.0-3.1.hum1 (aarch64, x86_64) * libcurl-devel-8.19.0-3.1.hum1 (aarch64, x86_64) * libcurl-minimal-8.19.0-3.1.hum1 (aarch64, x86_64) * curl-8.19.0-3.1.hum1.src (src)
Terms of Use: 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.
CVE-2026-1965

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.

6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE-303 - Incorrect Implementation of Authentication Algorithm
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:curl-0:8.19.0-3.1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:curl-0:8.19.0-3.1.hum1@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:curl-0:8.19.0-3.1.hum1@x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:libcurl-0:8.19.0-3.1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:libcurl-0:8.19.0-3.1.hum1@x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:libcurl-devel-0:8.19.0-3.1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:libcurl-devel-0:8.19.0-3.1.hum1@x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:libcurl-minimal-0:8.19.0-3.1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:libcurl-minimal-0:8.19.0-3.1.hum1@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-3783

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.

5.7 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
CWE-201 - Insertion of Sensitive Information Into Sent Data
Affected products
Fixed 9 products, the same list as for CVE-2026-1965
Threats
Impact Moderate
CVE-2026-3784

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.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE-305 - Authentication Bypass by Primary Weakness
Affected products
Fixed 9 products, the same list as for CVE-2026-1965
Threats
Impact Moderate
References
URL Category
https://access.redhat.com/errata/RHSA-2026:7432 self
https://images.redhat.com/ external
https://access.redhat.com/security/cve/CVE-2026-3783 external
https://access.redhat.com/security/updates/classi… external
https://access.redhat.com/security/cve/CVE-2026-3784 external
https://access.redhat.com/security/cve/CVE-2026-1965 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-1965 self
https://bugzilla.redhat.com/show_bug.cgi?id=2446448 external
https://www.cve.org/CVERecord?id=CVE-2026-1965 external
https://nvd.nist.gov/vuln/detail/CVE-2026-1965 external
https://curl.se/docs/CVE-2026-1965.html external
https://curl.se/docs/CVE-2026-1965.json external
https://access.redhat.com/security/cve/CVE-2026-3783 self
https://bugzilla.redhat.com/show_bug.cgi?id=2446450 external
https://www.cve.org/CVERecord?id=CVE-2026-3783 external
https://nvd.nist.gov/vuln/detail/CVE-2026-3783 external
http://www.openwall.com/lists/oss-security/2026/03/11/2 external
https://curl.se/docs/CVE-2026-3783.html external
https://curl.se/docs/CVE-2026-3783.json external
https://hackerone.com/reports/3583983 external
https://access.redhat.com/security/cve/CVE-2026-3784 self
https://bugzilla.redhat.com/show_bug.cgi?id=2446449 external
https://www.cve.org/CVERecord?id=CVE-2026-3784 external
https://nvd.nist.gov/vuln/detail/CVE-2026-3784 external
http://www.openwall.com/lists/oss-security/2026/03/11/3 external
https://curl.se/docs/CVE-2026-3784.html external
https://curl.se/docs/CVE-2026-3784.json external
https://hackerone.com/reports/3584903 external
To clipboard 

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          "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"
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          "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.",
          "title": "CVSS score applicability"
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          "url": "https://curl.se/docs/CVE-2026-1965.html"
        },
        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-1965.json",
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          "category": "vendor_fix",
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          "url": "https://access.redhat.com/errata/RHSA-2026:7432"
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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",
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        "id": "CWE-201",
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      "ids": [
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          "category": "description",
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect",
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        },
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          "category": "general",
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          "title": "CVSS score applicability"
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          "Red Hat Hardened Images:libcurl-minimal-0:8.19.0-3.1.hum1@x86_64"
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      },
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          "category": "self",
          "summary": "Canonical URL",
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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",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-3783",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-3783"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-3783",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3783"
        },
        {
          "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"
        },
        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-3783.html",
          "url": "https://curl.se/docs/CVE-2026-3783.html"
        },
        {
          "category": "external",
          "summary": "https://curl.se/docs/CVE-2026-3783.json",
          "url": "https://curl.se/docs/CVE-2026-3783.json"
        },
        {
          "category": "external",
          "summary": "https://hackerone.com/reports/3583983",
          "url": "https://hackerone.com/reports/3583983"
        }
      ],
      "release_date": "2026-03-11T10:09:08.746000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-04-10T19:17:19+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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            "Red Hat Hardened Images:curl-0:8.19.0-3.1.hum1@x86_64",
            "Red Hat Hardened Images:libcurl-0:8.19.0-3.1.hum1@aarch64",
            "Red Hat Hardened Images:libcurl-0:8.19.0-3.1.hum1@x86_64",
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            "Red Hat Hardened Images:libcurl-minimal-0:8.19.0-3.1.hum1@x86_64"
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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:7432"
        },
        {
          "category": "workaround",
          "details": "To prevent the leakage of OAuth2 bearer tokens, ensure that `.netrc` files are carefully managed. Avoid configuring `.netrc` entries for untrusted or unknown hostnames, particularly when `curl` is used with OAuth2 bearer tokens and is configured to follow redirects. Regularly review and restrict the scope of credentials stored in `.netrc` files to only explicitly trusted destinations.",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect"
    },
    {
      "cve": "CVE-2026-3784",
      "cwe": {
        "id": "CWE-305",
        "name": "Authentication Bypass by Primary Weakness"
      },
      "discovery_date": "2026-03-11T11:00:57.752827+00:00",
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2446449"
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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",
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        },
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          "category": "general",
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        {
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        },
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          "category": "external",
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            "Red Hat Hardened Images:libcurl-devel-0:8.19.0-3.1.hum1@aarch64",
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            "Red Hat Hardened Images:libcurl-0:8.19.0-3.1.hum1@x86_64",
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            "Red Hat Hardened Images:libcurl-devel-0:8.19.0-3.1.hum1@x86_64",
            "Red Hat Hardened Images:libcurl-minimal-0:8.19.0-3.1.hum1@aarch64",
            "Red Hat Hardened Images:libcurl-minimal-0:8.19.0-3.1.hum1@x86_64"
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            "Red Hat Hardened Images:curl-0:8.19.0-3.1.hum1@src",
            "Red Hat Hardened Images:curl-0:8.19.0-3.1.hum1@x86_64",
            "Red Hat Hardened Images:libcurl-0:8.19.0-3.1.hum1@aarch64",
            "Red Hat Hardened Images:libcurl-0:8.19.0-3.1.hum1@x86_64",
            "Red Hat Hardened Images:libcurl-devel-0:8.19.0-3.1.hum1@aarch64",
            "Red Hat Hardened Images:libcurl-devel-0:8.19.0-3.1.hum1@x86_64",
            "Red Hat Hardened Images:libcurl-minimal-0:8.19.0-3.1.hum1@aarch64",
            "Red Hat Hardened Images:libcurl-minimal-0:8.19.0-3.1.hum1@x86_64"
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "curl: curl: Unauthorized access due to improper HTTP proxy connection reuse"
    }
  ]
}



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