RHEL 10 : curl (RHSA-2026:72506)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:72506. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(350938);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/29");

  script_cve_id(
    "CVE-2025-14819",
    "CVE-2026-1965",
    "CVE-2026-3783",
    "CVE-2026-3784",
    "CVE-2026-8286",
    "CVE-2026-8458",
    "CVE-2026-8924",
    "CVE-2026-8926",
    "CVE-2026-8927",
    "CVE-2026-8932",
    "CVE-2026-9079",
    "CVE-2026-9547",
    "CVE-2026-11856",
    "CVE-2026-12064"
  );
  script_xref(name:"RHSA", value:"2026:72506");

  script_name(english:"RHEL 10 : curl (RHSA-2026:72506)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for curl.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:72506 advisory.

    The curl packages provide the libcurl library and the curl utility for downloading files from servers
    using various protocols, including HTTP, FTP, and LDAP.

    Security Fix(es):

    * curl: libcurl: Improper certificate validation due to cached TLS settings reuse (CVE-2025-14819)

    * curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication
    (CVE-2026-1965)

    * curl: curl: Unauthorized access due to improper HTTP proxy connection reuse (CVE-2026-3784)

    * curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect
    (CVE-2026-3783)

    * curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547)

    * libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse (CVE-2026-8932)

    * curl: curl: Information disclosure via incorrect .netrc password lookup (CVE-2026-8926)

    * curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286)

    * curl: libcurl: Unauthorized connection reuse due to a logical error (CVE-2026-8458)

    * curl: curl: Cookie injection via malicious HTTP server using super cookies (CVE-2026-8924)

    * curl: curl: Information disclosure via incorrect Digest authentication header reuse (CVE-2026-11856)

    * curl: curl: SSH host verification bypass when using schemeless URLs with SFTP/SCP (CVE-2026-12064)

    * curl: Information disclosure due to uncleared proxy authentication state (CVE-2026-8927)

    * libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials
    (CVE-2026-9079)

    For 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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2426408");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2446448");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2446449");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2446450");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496758");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496759");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496760");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496763");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496764");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496765");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496767");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496768");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496769");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2496771");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_72506.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?70128b0d");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:72506");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL curl package based on the guidance in RHSA-2026:72506.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-9079");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(201, 212, 289, 295, 303, 305, 347, 358, 565, 1025);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/01/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux_eus:10.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libcurl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libcurl-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libcurl-minimal");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release(operator: 'ge', os_version: os_version, rhel_version: '10')) audit(AUDIT_OS_NOT, 'Red Hat 10.x', 'Red Hat ' + os_version);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'release': '10',
    'sp': '0',
    'repo_relative_urls': [
      'content/e4s/rhel10/10.0/aarch64/appstream/debug',
      'content/e4s/rhel10/10.0/aarch64/appstream/os',
      'content/e4s/rhel10/10.0/aarch64/appstream/source/SRPMS',
      'content/e4s/rhel10/10.0/aarch64/baseos/debug',
      'content/e4s/rhel10/10.0/aarch64/baseos/os',
      'content/e4s/rhel10/10.0/aarch64/baseos/source/SRPMS',
      'content/e4s/rhel10/10.0/aarch64/highavailability/debug',
      'content/e4s/rhel10/10.0/aarch64/highavailability/os',
      'content/e4s/rhel10/10.0/aarch64/highavailability/source/SRPMS',
      'content/e4s/rhel10/10.0/aarch64/rt/debug',
      'content/e4s/rhel10/10.0/aarch64/rt/os',
      'content/e4s/rhel10/10.0/aarch64/rt/source/SRPMS',
      'content/e4s/rhel10/10.0/ppc64le/appstream/debug',
      'content/e4s/rhel10/10.0/ppc64le/appstream/os',
      'content/e4s/rhel10/10.0/ppc64le/appstream/source/SRPMS',
      'content/e4s/rhel10/10.0/ppc64le/baseos/debug',
      'content/e4s/rhel10/10.0/ppc64le/baseos/os',
      'content/e4s/rhel10/10.0/ppc64le/baseos/source/SRPMS',
      'content/e4s/rhel10/10.0/ppc64le/highavailability/debug',
      'content/e4s/rhel10/10.0/ppc64le/highavailability/os',
      'content/e4s/rhel10/10.0/ppc64le/highavailability/source/SRPMS',
      'content/e4s/rhel10/10.0/ppc64le/sap-solutions/debug',
      'content/e4s/rhel10/10.0/ppc64le/sap-solutions/os',
      'content/e4s/rhel10/10.0/ppc64le/sap-solutions/source/SRPMS',
      'content/e4s/rhel10/10.0/ppc64le/sap/debug',
      'content/e4s/rhel10/10.0/ppc64le/sap/os',
      'content/e4s/rhel10/10.0/ppc64le/sap/source/SRPMS',
      'content/e4s/rhel10/10.0/s390x/appstream/debug',
      'content/e4s/rhel10/10.0/s390x/appstream/os',
      'content/e4s/rhel10/10.0/s390x/appstream/source/SRPMS',
      'content/e4s/rhel10/10.0/s390x/baseos/debug',
      'content/e4s/rhel10/10.0/s390x/baseos/os',
      'content/e4s/rhel10/10.0/s390x/baseos/source/SRPMS',
      'content/e4s/rhel10/10.0/s390x/highavailability/debug',
      'content/e4s/rhel10/10.0/s390x/highavailability/os',
      'content/e4s/rhel10/10.0/s390x/highavailability/source/SRPMS',
      'content/e4s/rhel10/10.0/s390x/sap/debug',
      'content/e4s/rhel10/10.0/s390x/sap/os',
      'content/e4s/rhel10/10.0/s390x/sap/source/SRPMS',
      'content/e4s/rhel10/10.0/x86_64/appstream/debug',
      'content/e4s/rhel10/10.0/x86_64/appstream/os',
      'content/e4s/rhel10/10.0/x86_64/appstream/source/SRPMS',
      'content/e4s/rhel10/10.0/x86_64/baseos/debug',
      'content/e4s/rhel10/10.0/x86_64/baseos/os',
      'content/e4s/rhel10/10.0/x86_64/baseos/source/SRPMS',
      'content/e4s/rhel10/10.0/x86_64/highavailability/debug',
      'content/e4s/rhel10/10.0/x86_64/highavailability/os',
      'content/e4s/rhel10/10.0/x86_64/highavailability/source/SRPMS',
      'content/e4s/rhel10/10.0/x86_64/nfv/debug',
      'content/e4s/rhel10/10.0/x86_64/nfv/os',
      'content/e4s/rhel10/10.0/x86_64/nfv/source/SRPMS',
      'content/e4s/rhel10/10.0/x86_64/rt/debug',
      'content/e4s/rhel10/10.0/x86_64/rt/os',
      'content/e4s/rhel10/10.0/x86_64/rt/source/SRPMS',
      'content/e4s/rhel10/10.0/x86_64/sap-solutions/debug',
      'content/e4s/rhel10/10.0/x86_64/sap-solutions/os',
      'content/e4s/rhel10/10.0/x86_64/sap-solutions/source/SRPMS',
      'content/e4s/rhel10/10.0/x86_64/sap/debug',
      'content/e4s/rhel10/10.0/x86_64/sap/os',
      'content/e4s/rhel10/10.0/x86_64/sap/source/SRPMS',
      'content/eus/rhel10/10.0/aarch64/appstream/debug',
      'content/eus/rhel10/10.0/aarch64/appstream/os',
      'content/eus/rhel10/10.0/aarch64/appstream/source/SRPMS',
      'content/eus/rhel10/10.0/aarch64/baseos/debug',
      'content/eus/rhel10/10.0/aarch64/baseos/os',
      'content/eus/rhel10/10.0/aarch64/baseos/source/SRPMS',
      'content/eus/rhel10/10.0/aarch64/codeready-builder/debug',
      'content/eus/rhel10/10.0/aarch64/codeready-builder/os',
      'content/eus/rhel10/10.0/aarch64/codeready-builder/source/SRPMS',
      'content/eus/rhel10/10.0/aarch64/highavailability/debug',
      'content/eus/rhel10/10.0/aarch64/highavailability/os',
      'content/eus/rhel10/10.0/aarch64/highavailability/source/SRPMS',
      'content/eus/rhel10/10.0/aarch64/rt/debug',
      'content/eus/rhel10/10.0/aarch64/rt/os',
      'content/eus/rhel10/10.0/aarch64/rt/source/SRPMS',
      'content/eus/rhel10/10.0/aarch64/supplementary/debug',
      'content/eus/rhel10/10.0/aarch64/supplementary/os',
      'content/eus/rhel10/10.0/aarch64/supplementary/source/SRPMS',
      'content/eus/rhel10/10.0/ppc64le/appstream/debug',
      'content/eus/rhel10/10.0/ppc64le/appstream/os',
      'content/eus/rhel10/10.0/ppc64le/appstream/source/SRPMS',
      'content/eus/rhel10/10.0/ppc64le/baseos/debug',
      'content/eus/rhel10/10.0/ppc64le/baseos/os',
      'content/eus/rhel10/10.0/ppc64le/baseos/source/SRPMS',
      'content/eus/rhel10/10.0/ppc64le/codeready-builder/debug',
      'content/eus/rhel10/10.0/ppc64le/codeready-builder/os',
      'content/eus/rhel10/10.0/ppc64le/codeready-builder/source/SRPMS',
      'content/eus/rhel10/10.0/ppc64le/highavailability/debug',
      'content/eus/rhel10/10.0/ppc64le/highavailability/os',
      'content/eus/rhel10/10.0/ppc64le/highavailability/source/SRPMS',
      'content/eus/rhel10/10.0/ppc64le/sap-solutions/debug',
      'content/eus/rhel10/10.0/ppc64le/sap-solutions/os',
      'content/eus/rhel10/10.0/ppc64le/sap-solutions/source/SRPMS',
      'content/eus/rhel10/10.0/ppc64le/sap/debug',
      'content/eus/rhel10/10.0/ppc64le/sap/os',
      'content/eus/rhel10/10.0/ppc64le/sap/source/SRPMS',
      'content/eus/rhel10/10.0/ppc64le/supplementary/debug',
      'content/eus/rhel10/10.0/ppc64le/supplementary/os',
      'content/eus/rhel10/10.0/ppc64le/supplementary/source/SRPMS',
      'content/eus/rhel10/10.0/s390x/appstream/debug',
      'content/eus/rhel10/10.0/s390x/appstream/os',
      'content/eus/rhel10/10.0/s390x/appstream/source/SRPMS',
      'content/eus/rhel10/10.0/s390x/baseos/debug',
      'content/eus/rhel10/10.0/s390x/baseos/os',
      'content/eus/rhel10/10.0/s390x/baseos/source/SRPMS',
      'content/eus/rhel10/10.0/s390x/codeready-builder/debug',
      'content/eus/rhel10/10.0/s390x/codeready-builder/os',
      'content/eus/rhel10/10.0/s390x/codeready-builder/source/SRPMS',
      'content/eus/rhel10/10.0/s390x/highavailability/debug',
      'content/eus/rhel10/10.0/s390x/highavailability/os',
      'content/eus/rhel10/10.0/s390x/highavailability/source/SRPMS',
      'content/eus/rhel10/10.0/s390x/sap/debug',
      'content/eus/rhel10/10.0/s390x/sap/os',
      'content/eus/rhel10/10.0/s390x/sap/source/SRPMS',
      'content/eus/rhel10/10.0/s390x/supplementary/debug',
      'content/eus/rhel10/10.0/s390x/supplementary/os',
      'content/eus/rhel10/10.0/s390x/supplementary/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/appstream/debug',
      'content/eus/rhel10/10.0/x86_64/appstream/os',
      'content/eus/rhel10/10.0/x86_64/appstream/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/baseos/debug',
      'content/eus/rhel10/10.0/x86_64/baseos/os',
      'content/eus/rhel10/10.0/x86_64/baseos/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/codeready-builder/debug',
      'content/eus/rhel10/10.0/x86_64/codeready-builder/os',
      'content/eus/rhel10/10.0/x86_64/codeready-builder/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/highavailability/debug',
      'content/eus/rhel10/10.0/x86_64/highavailability/os',
      'content/eus/rhel10/10.0/x86_64/highavailability/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/nfv/debug',
      'content/eus/rhel10/10.0/x86_64/nfv/os',
      'content/eus/rhel10/10.0/x86_64/nfv/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/rt/debug',
      'content/eus/rhel10/10.0/x86_64/rt/os',
      'content/eus/rhel10/10.0/x86_64/rt/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/sap-solutions/debug',
      'content/eus/rhel10/10.0/x86_64/sap-solutions/os',
      'content/eus/rhel10/10.0/x86_64/sap-solutions/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/sap/debug',
      'content/eus/rhel10/10.0/x86_64/sap/os',
      'content/eus/rhel10/10.0/x86_64/sap/source/SRPMS',
      'content/eus/rhel10/10.0/x86_64/supplementary/debug',
      'content/eus/rhel10/10.0/x86_64/supplementary/os',
      'content/eus/rhel10/10.0/x86_64/supplementary/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'curl-8.12.1-1.el10_0.10', 'sp':'0', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libcurl-8.12.1-1.el10_0.10', 'sp':'0', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libcurl-devel-8.12.1-1.el10_0.10', 'sp':'0', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libcurl-minimal-8.12.1-1.el10_0.10', 'sp':'0', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var repo_relative_urls;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(rpm:exists_check))) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'curl / libcurl / libcurl-devel / libcurl-minimal');
}