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RHEL 9 : firefox (RHSA-2026:27734)

🗓️ 22 Jun 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 6 Views

RHEL 9 Firefox issues fixed by RHSA-2026:27734, including sandbox escapes and memory safety.

Related
Refs
Code
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-12305
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12308
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12307
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12314
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12298
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12312
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12290
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12310
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12306
16 Jun 202611:52
attackerkb
ATTACKERKB
CVE-2026-12309
16 Jun 202611:52
attackerkb
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:27734. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(321898);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/26");

  script_cve_id(
    "CVE-2026-12289",
    "CVE-2026-12290",
    "CVE-2026-12291",
    "CVE-2026-12292",
    "CVE-2026-12294",
    "CVE-2026-12295",
    "CVE-2026-12296",
    "CVE-2026-12297",
    "CVE-2026-12298",
    "CVE-2026-12299",
    "CVE-2026-12302",
    "CVE-2026-12304",
    "CVE-2026-12305",
    "CVE-2026-12306",
    "CVE-2026-12307",
    "CVE-2026-12308",
    "CVE-2026-12309",
    "CVE-2026-12310",
    "CVE-2026-12311",
    "CVE-2026-12312",
    "CVE-2026-12313",
    "CVE-2026-12314",
    "CVE-2026-12315",
    "CVE-2026-12324",
    "CVE-2026-12325",
    "CVE-2026-12327",
    "CVE-2026-12328",
    "CVE-2026-12329",
    "CVE-2026-12330"
  );
  script_xref(name:"RHSA", value:"2026:27734");
  script_xref(name:"IAVA", value:"2026-A-0607");

  script_name(english:"RHEL 9 : firefox (RHSA-2026:27734)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for firefox.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:27734 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and
    portability.

    Security Fix(es):

    * firefox: thunderbird: Sandbox escape in the DOM: Workers component (CVE-2026-12294)

    * firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process Sandboxing
    component (CVE-2026-12313)

    * firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process Sandboxing
    component (CVE-2026-12311)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12290)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox
    152 and Thunderbird 152 (CVE-2026-12327)

    * firefox: thunderbird: JIT miscompilation in the DOM: Core & HTML component (CVE-2026-12299)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12329)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12312)

    * firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-12302)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird
    ESR 140.12, Firefox 152 and Thunderbird 152 (CVE-2026-12328)

    * firefox: thunderbird: Incorrect boundary conditions in the Internationalization component
    (CVE-2026-12330)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12314)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12309)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12310)

    * firefox: thunderbird: Denial-of-service in the Graphics: ImageLib component (CVE-2026-12325)

    * firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-12295)

    * firefox: thunderbird: Privilege escalation in the Graphics: WebRender component (CVE-2026-12289)

    * firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-12315)

    * firefox: thunderbird: Sandbox escape in the Security: Process Sandboxing component (CVE-2026-12296)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12306)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12307)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Networking component
    (CVE-2026-12297)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12305)

    * firefox: thunderbird: Incorrect boundary conditions in the Web Audio component (CVE-2026-12292)

    * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12308)

    * firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component
    (CVE-2026-12324)

    * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-12304)

    * firefox: thunderbird: Use-after-free in the Networking: HTTP component (CVE-2026-12291)

    * firefox: thunderbird: Memory safety bug fixed in Firefox ESR 140.12 (CVE-2026-12298)

    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=2489207");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489208");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489209");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489210");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489211");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489212");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489214");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489215");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489233");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489236");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489237");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489239");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489240");
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  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489244");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2489248");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_27734.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b1153110");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:27734");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL firefox package based on the guidance in RHSA-2026:27734.");
  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:U/RL:OF/RC:C");
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  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-12297");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
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  script_cwe_id(131, 243, 266, 346, 403, 653, 733, 787, 807, 823, 825, 843, 1286);
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/22");
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      'content/public/ubi/dist/ubi9/9/x86_64/appstream/debug',
      'content/public/ubi/dist/ubi9/9/x86_64/appstream/os',
      'content/public/ubi/dist/ubi9/9/x86_64/appstream/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'firefox-140.12.0-1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'firefox-x11-140.12.0-1.el9_8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE}
    ]
  },
  {
    'release': '9',
    'sp': '8',
    'repo_relative_urls': [
      'content/e4s/rhel9/9.8/aarch64/appstream/debug',
      'content/e4s/rhel9/9.8/aarch64/appstream/os',
      'content/e4s/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/ppc64le/appstream/debug',
      'content/e4s/rhel9/9.8/ppc64le/appstream/os',
      'content/e4s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/s390x/appstream/debug',
      'content/e4s/rhel9/9.8/s390x/appstream/os',
      'content/e4s/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/x86_64/appstream/debug',
      'content/e4s/rhel9/9.8/x86_64/appstream/os',
      'content/e4s/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/aarch64/appstream/debug',
      'content/e6s/rhel9/9.8/aarch64/appstream/os',
      'content/e6s/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/ppc64le/appstream/debug',
      'content/e6s/rhel9/9.8/ppc64le/appstream/os',
      'content/e6s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/s390x/appstream/debug',
      'content/e6s/rhel9/9.8/s390x/appstream/os',
      'content/e6s/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/x86_64/appstream/debug',
      'content/e6s/rhel9/9.8/x86_64/appstream/os',
      'content/e6s/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/aarch64/appstream/debug',
      'content/eus/rhel9/9.8/aarch64/appstream/os',
      'content/eus/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/ppc64le/appstream/debug',
      'content/eus/rhel9/9.8/ppc64le/appstream/os',
      'content/eus/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/s390x/appstream/debug',
      'content/eus/rhel9/9.8/s390x/appstream/os',
      'content/eus/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/x86_64/appstream/debug',
      'content/eus/rhel9/9.8/x86_64/appstream/os',
      'content/eus/rhel9/9.8/x86_64/appstream/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'firefox-140.12.0-1.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'firefox-x11-140.12.0-1.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':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, 'firefox / firefox-x11');
}

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26 Jun 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.19.6
EPSS0.0045
SSVC
6