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Linux Distros Unpatched Vulnerability : CVE-2026-113868

🗓️ 21 Oct 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 3 Views

Thunderbird NTLM authentication flaw allows uninitialized memory disclosure or DoS.

Related
Refs
Code
ReporterTitlePublishedViews
Family
circl
Circl		CVE-2026-113868
20 Oct 202619:30
–circl
cve
CVE		CVE-2026-113868
20 Oct 202619:14
–cve
cvelist
Cvelist		CVE-2026-113868 Uninitialized memory disclosure and out-of-bounds read in POP3 and SMTP NTLM authentication
20 Oct 202619:14
–cvelist
debiancve
Debian CVE		CVE-2026-113868
20 Oct 202619:14
–debiancve
euvd
EUVD		EUVD-2026-105295
20 Oct 202619:14
–euvd
kaspersky
Kaspersky		KLA91360 Multiple vulnerabilities in Mozilla Thunderbird
20 Oct 202600:00
–kaspersky
kaspersky
Kaspersky		KLA91364 Multiple vulnerabilities in Mozilla Thunderbird ESR
20 Oct 202600:00
–kaspersky
nessus
Tenable Nessus		Mozilla Thunderbird < 153.5.1
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		Mozilla Thunderbird < 158.0.1
21 Oct 202600:00
–nessus
nessus
Tenable Nessus		Mozilla Thunderbird < 153.5.1
21 Oct 202600:00
–nessus
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(368985);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/23");

  script_cve_id("CVE-2026-113868");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-113868");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - When authenticating to a POP3 or SMTP server using NTLM, Thunderbird did not check whether the server's
    challenge was valid base64. A malicious server could send a challenge that caused Thunderbird to include
    uninitialized heap memory in its NTLM response, disclosing that memory to the server. A challenge
    consisting only of base64 padding also caused an out-of-bounds read, crashing Thunderbird. This affected
    accounts configured to use NTLM or GSSAPI authentication. The uninitialized memory disclosure only
    affected NTLM. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.
    (CVE-2026-113868)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-113868");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-113868");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-113868");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-113868");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:thunderbird");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:thunderbird");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:thunderbird");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:thunderbird");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-26.04");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-l10n-af"},
          {"reference": "thunderbird-l10n-all"},
          {"reference": "thunderbird-l10n-ar"},
          {"reference": "thunderbird-l10n-ast"},
          {"reference": "thunderbird-l10n-be"},
          {"reference": "thunderbird-l10n-bg"},
          {"reference": "thunderbird-l10n-br"},
          {"reference": "thunderbird-l10n-ca"},
          {"reference": "thunderbird-l10n-cak"},
          {"reference": "thunderbird-l10n-cs"},
          {"reference": "thunderbird-l10n-cy"},
          {"reference": "thunderbird-l10n-da"},
          {"reference": "thunderbird-l10n-de"},
          {"reference": "thunderbird-l10n-dsb"},
          {"reference": "thunderbird-l10n-el"},
          {"reference": "thunderbird-l10n-en-ca"},
          {"reference": "thunderbird-l10n-en-gb"},
          {"reference": "thunderbird-l10n-es-ar"},
          {"reference": "thunderbird-l10n-es-es"},
          {"reference": "thunderbird-l10n-es-mx"},
          {"reference": "thunderbird-l10n-et"},
          {"reference": "thunderbird-l10n-eu"},
          {"reference": "thunderbird-l10n-fi"},
          {"reference": "thunderbird-l10n-fr"},
          {"reference": "thunderbird-l10n-fy-nl"},
          {"reference": "thunderbird-l10n-ga-ie"},
          {"reference": "thunderbird-l10n-gd"},
          {"reference": "thunderbird-l10n-gl"},
          {"reference": "thunderbird-l10n-he"},
          {"reference": "thunderbird-l10n-hr"},
          {"reference": "thunderbird-l10n-hsb"},
          {"reference": "thunderbird-l10n-hu"},
          {"reference": "thunderbird-l10n-hy-am"},
          {"reference": "thunderbird-l10n-id"},
          {"reference": "thunderbird-l10n-is"},
          {"reference": "thunderbird-l10n-it"},
          {"reference": "thunderbird-l10n-ja"},
          {"reference": "thunderbird-l10n-ka"},
          {"reference": "thunderbird-l10n-kab"},
          {"reference": "thunderbird-l10n-kk"},
          {"reference": "thunderbird-l10n-ko"},
          {"reference": "thunderbird-l10n-lt"},
          {"reference": "thunderbird-l10n-lv"},
          {"reference": "thunderbird-l10n-ms"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-l10n-af"},
          {"reference": "thunderbird-l10n-all"},
          {"reference": "thunderbird-l10n-ar"},
          {"reference": "thunderbird-l10n-ast"},
          {"reference": "thunderbird-l10n-be"},
          {"reference": "thunderbird-l10n-bg"},
          {"reference": "thunderbird-l10n-br"},
          {"reference": "thunderbird-l10n-ca"},
          {"reference": "thunderbird-l10n-cak"},
          {"reference": "thunderbird-l10n-cs"},
          {"reference": "thunderbird-l10n-cy"},
          {"reference": "thunderbird-l10n-da"},
          {"reference": "thunderbird-l10n-de"},
          {"reference": "thunderbird-l10n-dsb"},
          {"reference": "thunderbird-l10n-el"},
          {"reference": "thunderbird-l10n-en-ca"},
          {"reference": "thunderbird-l10n-en-gb"},
          {"reference": "thunderbird-l10n-es-ar"},
          {"reference": "thunderbird-l10n-es-es"},
          {"reference": "thunderbird-l10n-es-mx"},
          {"reference": "thunderbird-l10n-et"},
          {"reference": "thunderbird-l10n-eu"},
          {"reference": "thunderbird-l10n-fi"},
          {"reference": "thunderbird-l10n-fr"},
          {"reference": "thunderbird-l10n-fy-nl"},
          {"reference": "thunderbird-l10n-ga-ie"},
          {"reference": "thunderbird-l10n-gd"},
          {"reference": "thunderbird-l10n-gl"},
          {"reference": "thunderbird-l10n-he"},
          {"reference": "thunderbird-l10n-hr"},
          {"reference": "thunderbird-l10n-hsb"},
          {"reference": "thunderbird-l10n-hu"},
          {"reference": "thunderbird-l10n-hy-am"},
          {"reference": "thunderbird-l10n-id"},
          {"reference": "thunderbird-l10n-is"},
          {"reference": "thunderbird-l10n-it"},
          {"reference": "thunderbird-l10n-ja"},
          {"reference": "thunderbird-l10n-ka"},
          {"reference": "thunderbird-l10n-kab"},
          {"reference": "thunderbird-l10n-kk"},
          {"reference": "thunderbird-l10n-ko"},
          {"reference": "thunderbird-l10n-lt"},
          {"reference": "thunderbird-l10n-lv"},
          {"reference": "thunderbird-l10n-ms"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-l10n-af"},
          {"reference": "thunderbird-l10n-all"},
          {"reference": "thunderbird-l10n-ar"},
          {"reference": "thunderbird-l10n-ast"},
          {"reference": "thunderbird-l10n-be"},
          {"reference": "thunderbird-l10n-bg"},
          {"reference": "thunderbird-l10n-br"},
          {"reference": "thunderbird-l10n-ca"},
          {"reference": "thunderbird-l10n-cak"},
          {"reference": "thunderbird-l10n-cs"},
          {"reference": "thunderbird-l10n-cy"},
          {"reference": "thunderbird-l10n-da"},
          {"reference": "thunderbird-l10n-de"},
          {"reference": "thunderbird-l10n-dsb"},
          {"reference": "thunderbird-l10n-el"},
          {"reference": "thunderbird-l10n-en-ca"},
          {"reference": "thunderbird-l10n-en-gb"},
          {"reference": "thunderbird-l10n-es-ar"},
          {"reference": "thunderbird-l10n-es-es"},
          {"reference": "thunderbird-l10n-es-mx"},
          {"reference": "thunderbird-l10n-et"},
          {"reference": "thunderbird-l10n-eu"},
          {"reference": "thunderbird-l10n-fi"},
          {"reference": "thunderbird-l10n-fr"},
          {"reference": "thunderbird-l10n-fy-nl"},
          {"reference": "thunderbird-l10n-ga-ie"},
          {"reference": "thunderbird-l10n-gd"},
          {"reference": "thunderbird-l10n-gl"},
          {"reference": "thunderbird-l10n-he"},
          {"reference": "thunderbird-l10n-hr"},
          {"reference": "thunderbird-l10n-hsb"},
          {"reference": "thunderbird-l10n-hu"},
          {"reference": "thunderbird-l10n-hy-am"},
          {"reference": "thunderbird-l10n-id"},
          {"reference": "thunderbird-l10n-is"},
          {"reference": "thunderbird-l10n-it"},
          {"reference": "thunderbird-l10n-ja"},
          {"reference": "thunderbird-l10n-ka"},
          {"reference": "thunderbird-l10n-kab"},
          {"reference": "thunderbird-l10n-kk"},
          {"reference": "thunderbird-l10n-ko"},
          {"reference": "thunderbird-l10n-lt"},
          {"reference": "thunderbird-l10n-lv"},
          {"reference": "thunderbird-l10n-ms"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-dbg"},
          {"reference": "thunderbird-dev"},
          {"reference": "thunderbird-gnome-support"},
          {"reference": "thunderbird-gnome-support-dbg"},
          {"reference": "thunderbird-locale-af"},
          {"reference": "thunderbird-locale-ar"},
          {"reference": "thunderbird-locale-ast"},
          {"reference": "thunderbird-locale-be"},
          {"reference": "thunderbird-locale-bg"},
          {"reference": "thunderbird-locale-bn"},
          {"reference": "thunderbird-locale-bn-bd"},
          {"reference": "thunderbird-locale-br"},
          {"reference": "thunderbird-locale-ca"},
          {"reference": "thunderbird-locale-cak"},
          {"reference": "thunderbird-locale-cs"},
          {"reference": "thunderbird-locale-cy"},
          {"reference": "thunderbird-locale-da"},
          {"reference": "thunderbird-locale-de"},
          {"reference": "thunderbird-locale-dsb"},
          {"reference": "thunderbird-locale-el"},
          {"reference": "thunderbird-locale-en-gb"},
          {"reference": "thunderbird-locale-en-us"},
          {"reference": "thunderbird-locale-es-ar"},
          {"reference": "thunderbird-locale-es-es"},
          {"reference": "thunderbird-locale-fy-nl"},
          {"reference": "thunderbird-locale-ga-ie"},
          {"reference": "thunderbird-locale-nb-no"},
          {"reference": "thunderbird-locale-nn-no"},
          {"reference": "thunderbird-locale-pa-in"},
          {"reference": "thunderbird-locale-pt-br"},
          {"reference": "thunderbird-locale-pt-pt"},
          {"reference": "thunderbird-locale-sv-se"},
          {"reference": "thunderbird-locale-ta-lk"},
          {"reference": "thunderbird-locale-zh-cn"},
          {"reference": "thunderbird-locale-zh-tw"},
          {"reference": "thunderbird-mozsymbols"},
          {"reference": "xul-ext-calendar-timezones"},
          {"reference": "xul-ext-gdata-provider"},
          {"reference": "xul-ext-lightning"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-locale-af"},
          {"reference": "thunderbird-locale-ar"},
          {"reference": "thunderbird-locale-ast"},
          {"reference": "thunderbird-locale-be"},
          {"reference": "thunderbird-locale-bg"},
          {"reference": "thunderbird-locale-bn"},
          {"reference": "thunderbird-locale-bn-bd"},
          {"reference": "thunderbird-locale-br"},
          {"reference": "thunderbird-locale-ca"},
          {"reference": "thunderbird-locale-cak"},
          {"reference": "thunderbird-locale-cs"},
          {"reference": "thunderbird-locale-cy"},
          {"reference": "thunderbird-locale-da"},
          {"reference": "thunderbird-locale-de"},
          {"reference": "thunderbird-locale-dsb"},
          {"reference": "thunderbird-locale-el"},
          {"reference": "thunderbird-locale-en"},
          {"reference": "thunderbird-locale-en-gb"},
          {"reference": "thunderbird-locale-en-us"},
          {"reference": "thunderbird-locale-es"},
          {"reference": "thunderbird-locale-es-ar"},
          {"reference": "thunderbird-locale-es-es"},
          {"reference": "thunderbird-locale-et"},
          {"reference": "thunderbird-locale-eu"},
          {"reference": "thunderbird-locale-fa"},
          {"reference": "thunderbird-locale-fi"},
          {"reference": "thunderbird-locale-fr"},
          {"reference": "thunderbird-locale-fy"},
          {"reference": "thunderbird-locale-fy-nl"},
          {"reference": "thunderbird-locale-ga"},
          {"reference": "thunderbird-locale-ga-ie"},
          {"reference": "thunderbird-locale-gd"},
          {"reference": "thunderbird-locale-gl"},
          {"reference": "thunderbird-locale-he"},
          {"reference": "thunderbird-locale-hr"},
          {"reference": "thunderbird-locale-hsb"},
          {"reference": "thunderbird-locale-hu"},
          {"reference": "thunderbird-locale-hy"},
          {"reference": "thunderbird-locale-id"},
          {"reference": "thunderbird-locale-is"},
          {"reference": "thunderbird-locale-it"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "thunderbird"},
          {"reference": "thunderbird-locale-af"},
          {"reference": "thunderbird-locale-ar"},
          {"reference": "thunderbird-locale-ast"},
          {"reference": "thunderbird-locale-be"},
          {"reference": "thunderbird-locale-bg"},
          {"reference": "thunderbird-locale-bn"},
          {"reference": "thunderbird-locale-bn-bd"},
          {"reference": "thunderbird-locale-br"},
          {"reference": "thunderbird-locale-ca"},
          {"reference": "thunderbird-locale-cak"},
          {"reference": "thunderbird-locale-cs"},
          {"reference": "thunderbird-locale-cy"},
          {"reference": "thunderbird-locale-da"},
          {"reference": "thunderbird-locale-de"},
          {"reference": "thunderbird-locale-dsb"},
          {"reference": "thunderbird-locale-el"},
          {"reference": "thunderbird-locale-en"},
          {"reference": "thunderbird-locale-en-gb"},
          {"reference": "thunderbird-locale-en-us"},
          {"reference": "thunderbird-locale-es"},
          {"reference": "thunderbird-locale-es-ar"},
          {"reference": "thunderbird-locale-es-es"},
          {"reference": "thunderbird-locale-et"},
          {"reference": "thunderbird-locale-eu"},
          {"reference": "thunderbird-locale-fa"},
          {"reference": "thunderbird-locale-fi"},
          {"reference": "thunderbird-locale-fr"},
          {"reference": "thunderbird-locale-fy"},
          {"reference": "thunderbird-locale-fy-nl"},
          {"reference": "thunderbird-locale-ga"},
          {"reference": "thunderbird-locale-ga-ie"},
          {"reference": "thunderbird-locale-gd"},
          {"reference": "thunderbird-locale-gl"},
          {"reference": "thunderbird-locale-he"},
          {"reference": "thunderbird-locale-hr"},
          {"reference": "thunderbird-locale-hsb"},
          {"reference": "thunderbird-locale-hu"},
          {"reference": "thunderbird-locale-hy"},
          {"reference": "thunderbird-locale-id"},
          {"reference": "thunderbird-locale-is"},
          {"reference": "thunderbird-locale-it"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "thunderbird"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "thunderbird"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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23 Oct 2026 00:00Current
6.1Medium risk
Vulners AI Score6.1
EPSS0.00425
ThunderbirdNTLMuninitialized memory disclosureout-of-bounds readDoSPOP3SMTP
3