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Linux Distros Unpatched Vulnerability : CVE-2026-119197

🗓️ 30 Oct 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 3 Views

DoS in pyasn1 via quadratic decoding time of binary REAL mantissa.

Related
Refs
Code
ReporterTitlePublishedViews
Family
cgr
Chainguard
CVE-2026-119197 vulnerabilities
31 Oct 202608:55
–cgr
circl
Circl
CVE-2026-119197
29 Oct 202619:51
–circl
cve
CVE
CVE-2026-119197
29 Oct 202619:48
–cve
cvelist
Cvelist
CVE-2026-119197 pyasn1: Quadratic-complexity denial of service in binary REAL decoding
29 Oct 202619:48
–cvelist
debiancve
Debian CVE
CVE-2026-119197
30 Oct 202610:11
–debiancve
euvd
EUVD
EUVD-2026-113353
30 Oct 202623:06
–euvd
github
Github Security Blog
pyasn1 has quadratic-complexity denial of service in binary REAL decoding
30 Oct 202623:06
–github
mend
Mend
CVE-2026-119197
29 Oct 202619:48
–mend
mscve
Microsoft CVE
pyasn1: Quadratic-complexity denial of service in binary REAL decoding
31 Oct 202608:01
–mscve
nvd
NVD
CVE-2026-119197
29 Oct 202620:17
–nvd
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(374248);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/30");

  script_cve_id("CVE-2026-119197");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-119197");

  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.

  - pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, binary REAL decoding builds a large mantissa
    one octet at a time by shifting a growing integer and slicing the remaining byte string. Attacker-
    controlled ASN.1 includes a binary-encoded REAL with a large mantissa and reaches BER, CER, or DER
    decode(), with or without a schema containing REAL. RealPayloadDecoder.valueDecoder repeatedly performs a
    left shift, OR, and suffix copy for every mantissa octet, making decode time quadratic in mantissa length.
    A comparatively small REAL value can hold a decoding worker on one CPU core for seconds or longer and
    cause availability loss. This issue is fixed in version 0.6.5. (CVE-2026-119197)

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-2026-119197");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-119197");
  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:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/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-2026-119197");

  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:"2026/10/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-rsa");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-agents-sbd");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-libvirt");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-multicast");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-serial");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:fence-virtd-tcp");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:resource-agents-paf");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:sap-cluster-connector");
  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-7", "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-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

  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": "python-pyasn1-doc"},
          {"reference": "python3-pyasn1"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "python-pyasn1-doc"},
          {"reference": "python3-pyasn1"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "python-pyasn1-doc"},
          {"reference": "python3-pyasn1"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "python-pyasn1"},
          {"reference": "python3-pyasn1"},
          {"reference": "python3-pyasn1-modules"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "resource-agents"},
          {"reference": "resource-agents-aliyun"},
          {"reference": "resource-agents-gcp"},
          {"reference": "resource-agents-sap"},
          {"reference": "resource-agents-sap-hana"},
          {"reference": "resource-agents-sap-hana-scaleout"},
          {"reference": "sap-cluster-connector"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "resource-agents"},
          {"reference": "resource-agents-aliyun"},
          {"reference": "resource-agents-gcp"},
          {"reference": "resource-agents-sap"},
          {"reference": "resource-agents-sap-hana"},
          {"reference": "resource-agents-sap-hana-scaleout"},
          {"reference": "sap-cluster-connector"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "fence-agents"},
          {"reference": "fence-agents-aliyun"},
          {"reference": "fence-agents-all"},
          {"reference": "fence-agents-amt-ws"},
          {"reference": "fence-agents-apc"},
          {"reference": "fence-agents-apc-snmp"},
          {"reference": "fence-agents-aws"},
          {"reference": "fence-agents-azure-arm"},
          {"reference": "fence-agents-bladecenter"},
          {"reference": "fence-agents-brocade"},
          {"reference": "fence-agents-cisco-mds"},
          {"reference": "fence-agents-cisco-ucs"},
          {"reference": "fence-agents-common"},
          {"reference": "fence-agents-compute"},
          {"reference": "fence-agents-drac5"},
          {"reference": "fence-agents-eaton-snmp"},
          {"reference": "fence-agents-emerson"},
          {"reference": "fence-agents-eps"},
          {"reference": "fence-agents-gce"},
          {"reference": "fence-agents-heuristics-ping"},
          {"reference": "fence-agents-hpblade"},
          {"reference": "fence-agents-ibm-powervs"},
          {"reference": "fence-agents-ibm-vpc"},
          {"reference": "fence-agents-ibmblade"},
          {"reference": "fence-agents-ifmib"},
          {"reference": "fence-agents-ilo-moonshot"},
          {"reference": "fence-agents-ilo-mp"},
          {"reference": "fence-agents-ilo-ssh"},
          {"reference": "fence-agents-ilo2"},
          {"reference": "fence-agents-intelmodular"},
          {"reference": "fence-agents-ipdu"},
          {"reference": "fence-agents-ipmilan"},
          {"reference": "fence-agents-kdump"},
          {"reference": "fence-agents-kubevirt"},
          {"reference": "fence-agents-lpar"},
          {"reference": "fence-agents-mpath"},
          {"reference": "fence-agents-nutanix-ahv"},
          {"reference": "fence-agents-openstack"},
          {"reference": "fence-agents-redfish"},
          {"reference": "fence-agents-rhevm"},
          {"reference": "fence-agents-rsa"},
          {"reference": "fence-agents-rsb"},
          {"reference": "fence-agents-sbd"},
          {"reference": "fence-agents-scsi"},
          {"reference": "fence-agents-virsh"},
          {"reference": "fence-agents-vmware-rest"},
          {"reference": "fence-agents-vmware-soap"},
          {"reference": "fence-agents-wti"},
          {"reference": "fence-agents-zvm"},
          {"reference": "python-pyasn1"},
          {"reference": "python3-pyasn1"},
          {"reference": "python3-pyasn1-modules"},
          {"reference": "resource-agents"},
          {"reference": "resource-agents-aliyun"},
          {"reference": "resource-agents-gcp"},
          {"reference": "resource-agents-paf"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "fence-agents"},
          {"reference": "fence-agents-aliyun"},
          {"reference": "fence-agents-all"},
          {"reference": "fence-agents-amt-ws"},
          {"reference": "fence-agents-apc"},
          {"reference": "fence-agents-apc-snmp"},
          {"reference": "fence-agents-aws"},
          {"reference": "fence-agents-azure-arm"},
          {"reference": "fence-agents-bladecenter"},
          {"reference": "fence-agents-brocade"},
          {"reference": "fence-agents-cisco-mds"},
          {"reference": "fence-agents-cisco-ucs"},
          {"reference": "fence-agents-common"},
          {"reference": "fence-agents-compute"},
          {"reference": "fence-agents-drac5"},
          {"reference": "fence-agents-eaton-snmp"},
          {"reference": "fence-agents-emerson"},
          {"reference": "fence-agents-eps"},
          {"reference": "fence-agents-gce"},
          {"reference": "fence-agents-heuristics-ping"},
          {"reference": "fence-agents-hpblade"},
          {"reference": "fence-agents-ibm-powervs"},
          {"reference": "fence-agents-ibm-vpc"},
          {"reference": "fence-agents-ibmblade"},
          {"reference": "fence-agents-ifmib"},
          {"reference": "fence-agents-ilo-moonshot"},
          {"reference": "fence-agents-ilo-mp"},
          {"reference": "fence-agents-ilo-ssh"},
          {"reference": "fence-agents-ilo2"},
          {"reference": "fence-agents-intelmodular"},
          {"reference": "fence-agents-ipdu"},
          {"reference": "fence-agents-ipmilan"},
          {"reference": "fence-agents-kdump"},
          {"reference": "fence-agents-kubevirt"},
          {"reference": "fence-agents-lpar"},
          {"reference": "fence-agents-mpath"},
          {"reference": "fence-agents-nutanix-ahv"},
          {"reference": "fence-agents-openstack"},
          {"reference": "fence-agents-redfish"},
          {"reference": "fence-agents-rhevm"},
          {"reference": "fence-agents-rsa"},
          {"reference": "fence-agents-rsb"},
          {"reference": "fence-agents-sbd"},
          {"reference": "fence-agents-scsi"},
          {"reference": "fence-agents-virsh"},
          {"reference": "fence-agents-vmware-rest"},
          {"reference": "fence-agents-vmware-soap"},
          {"reference": "fence-agents-wti"},
          {"reference": "fence-agents-zvm"},
          {"reference": "python-pyasn1"},
          {"reference": "python3-pyasn1"},
          {"reference": "python3-pyasn1-modules"},
          {"reference": "resource-agents"},
          {"reference": "resource-agents-aliyun"},
          {"reference": "resource-agents-gcp"},
          {"reference": "resource-agents-paf"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "fence-agents"},
          {"reference": "fence-agents-aliyun"},
          {"reference": "fence-agents-all"},
          {"reference": "fence-agents-amt-ws"},
          {"reference": "fence-agents-apc"},
          {"reference": "fence-agents-apc-snmp"},
          {"reference": "fence-agents-aws"},
          {"reference": "fence-agents-azure-arm"},
          {"reference": "fence-agents-bladecenter"},
          {"reference": "fence-agents-brocade"},
          {"reference": "fence-agents-cisco-mds"},
          {"reference": "fence-agents-cisco-ucs"},
          {"reference": "fence-agents-common"},
          {"reference": "fence-agents-compute"},
          {"reference": "fence-agents-drac5"},
          {"reference": "fence-agents-eaton-snmp"},
          {"reference": "fence-agents-emerson"},
          {"reference": "fence-agents-eps"},
          {"reference": "fence-agents-gce"},
          {"reference": "fence-agents-heuristics-ping"},
          {"reference": "fence-agents-hpblade"},
          {"reference": "fence-agents-ibm-powervs"},
          {"reference": "fence-agents-ibm-vpc"},
          {"reference": "fence-agents-ibmblade"},
          {"reference": "fence-agents-ifmib"},
          {"reference": "fence-agents-ilo-moonshot"},
          {"reference": "fence-agents-ilo-mp"},
          {"reference": "fence-agents-ilo-ssh"},
          {"reference": "fence-agents-ilo2"},
          {"reference": "fence-agents-intelmodular"},
          {"reference": "fence-agents-ipdu"},
          {"reference": "fence-agents-ipmilan"},
          {"reference": "fence-agents-kdump"},
          {"reference": "fence-agents-kubevirt"},
          {"reference": "fence-agents-lpar"},
          {"reference": "fence-agents-mpath"},
          {"reference": "fence-agents-nutanix-ahv"},
          {"reference": "fence-agents-openstack"},
          {"reference": "fence-agents-redfish"},
          {"reference": "fence-agents-rhevm"},
          {"reference": "fence-agents-rsa"},
          {"reference": "fence-agents-rsb"},
          {"reference": "fence-agents-sbd"},
          {"reference": "fence-agents-scsi"},
          {"reference": "fence-agents-virsh"},
          {"reference": "fence-agents-vmware-rest"},
          {"reference": "fence-agents-vmware-soap"},
          {"reference": "fence-agents-wti"},
          {"reference": "fence-agents-zvm"},
          {"reference": "fence-virt"},
          {"reference": "fence-virtd"},
          {"reference": "fence-virtd-cpg"},
          {"reference": "fence-virtd-libvirt"},
          {"reference": "fence-virtd-multicast"},
          {"reference": "fence-virtd-serial"},
          {"reference": "fence-virtd-tcp"},
          {"reference": "ha-cloud-support"},
          {"reference": "python-pyasn1"},
          {"reference": "python3-pyasn1"},
          {"reference": "python3-pyasn1-modules"}
        ]
      }
    ]
  }
};

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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30 Oct 2026 00:00Current
6Medium risk
Vulners AI Score6
CVSS 3.17.5
EPSS0.00425
SSVC
3