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Linux Distros Unpatched Vulnerability : CVE-2026-93599

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

rustls-webpki through 0.103.12 panic in bit_string_flags() via crafted CRL enables DoS.

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Refs
Code
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(348652);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/23");

  script_cve_id("CVE-2026-93599");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-93599");

  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.

  - rustls-webpki through 0.103.12 (and 0.104.0-alpha releases before 0.104.0-alpha.7) contains a reachable
    panic in bit_string_flags() in src/der.rs. The input guard fails to reject a named-bit BIT STRING whose
    content is exactly [0x00] (zero padding bits and no data bytes), so raw_bits.len() - 1 underflows on the
    empty slice and the subsequent index operation panics (subtract-with-overflow in debug, index-out-of-
    bounds in release). The condition is reachable through the public API
    BorrowedCertRevocationList::from_der() when a CRL contains an issuingDistributionPoint extension with such
    an onlySomeReasons value. Exploitation requires an application that explicitly opts in to CRL revocation
    checking by passing RevocationOptions to verify_for_usage() and that parses CRL bytes obtained from a
    source the attacker can influence; the default rustls configuration, which does not use RevocationOptions,
    is unaffected. A crafted CRL causes a denial of service via the panic. Fixed in 0.103.13 and
    0.104.0-alpha.7. (CVE-2026-93599)

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-2026-93599");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-93599");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-93599");
  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");
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  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-93599");

  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:"2026/09/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
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  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-13", "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", "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-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "librust-rustls-webpki-dev"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "rust-rustls-webpki"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "rust-rustls-webpki"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "afterburn"},
          {"reference": "afterburn-dracut"},
          {"reference": "clevis-pin-trustee"},
          {"reference": "coreos-installer"},
          {"reference": "coreos-installer-bootinfra"},
          {"reference": "coreos-installer-dracut"},
          {"reference": "firefox"},
          {"reference": "glx-utils"},
          {"reference": "goose"},
          {"reference": "ldb-tools"},
          {"reference": "libldb"},
          {"reference": "libldb-devel"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "mesa-demos"},
          {"reference": "mesa-dri-drivers"},
          {"reference": "mesa-filesystem"},
          {"reference": "mesa-libEGL"},
          {"reference": "mesa-libEGL-devel"},
          {"reference": "mesa-libGL"},
          {"reference": "mesa-libGL-devel"},
          {"reference": "mesa-libGLU"},
          {"reference": "mesa-libGLU-devel"},
          {"reference": "mesa-libOSMesa"},
          {"reference": "mesa-libOSMesa-devel"},
          {"reference": "mesa-libgbm"},
          {"reference": "mesa-libgbm-devel"},
          {"reference": "mesa-libglapi"},
          {"reference": "mesa-libxatracker"},
          {"reference": "mesa-vulkan-drivers"},
          {"reference": "python3-ldb"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-test"},
          {"reference": "rpm-ostree"},
          {"reference": "rpm-ostree-libs"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-gpupdate"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"},
          {"reference": "sequoia-sq"},
          {"reference": "thunderbird"},
          {"reference": "trustee-guest-components"},
          {"reference": "trustee-kbs"},
          {"reference": "virt-firmware-rs"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "firefox"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "firefox"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "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": "afterburn"},
          {"reference": "afterburn-dracut"},
          {"reference": "clevis-pin-trustee"},
          {"reference": "coreos-installer"},
          {"reference": "coreos-installer-bootinfra"},
          {"reference": "coreos-installer-dracut"},
          {"reference": "ctdb"},
          {"reference": "firefox"},
          {"reference": "firefox-x11"},
          {"reference": "glx-utils"},
          {"reference": "goose"},
          {"reference": "ldb-tools"},
          {"reference": "libldb"},
          {"reference": "libldb-devel"},
          {"reference": "libnetapi"},
          {"reference": "libnetapi-devel"},
          {"reference": "libsmbclient"},
          {"reference": "libsmbclient-devel"},
          {"reference": "libwbclient"},
          {"reference": "libwbclient-devel"},
          {"reference": "mesa-demos"},
          {"reference": "mesa-dri-drivers"},
          {"reference": "mesa-filesystem"},
          {"reference": "mesa-libEGL"},
          {"reference": "mesa-libEGL-devel"},
          {"reference": "mesa-libGL"},
          {"reference": "mesa-libGL-devel"},
          {"reference": "mesa-libGLU"},
          {"reference": "mesa-libGLU-devel"},
          {"reference": "mesa-libOSMesa"},
          {"reference": "mesa-libOSMesa-devel"},
          {"reference": "mesa-libgbm"},
          {"reference": "mesa-libgbm-devel"},
          {"reference": "mesa-libglapi"},
          {"reference": "mesa-libxatracker"},
          {"reference": "mesa-vulkan-drivers"},
          {"reference": "python3-ldb"},
          {"reference": "python3-samba"},
          {"reference": "python3-samba-dc"},
          {"reference": "python3-samba-devel"},
          {"reference": "python3-samba-test"},
          {"reference": "rpm-ostree"},
          {"reference": "rpm-ostree-devel"},
          {"reference": "rpm-ostree-libs"},
          {"reference": "rust-sequoia-sq"},
          {"reference": "samba"},
          {"reference": "samba-client"},
          {"reference": "samba-client-libs"},
          {"reference": "samba-common"},
          {"reference": "samba-common-libs"},
          {"reference": "samba-common-tools"},
          {"reference": "samba-dc-libs"},
          {"reference": "samba-dcerpc"},
          {"reference": "samba-devel"},
          {"reference": "samba-gpupdate"},
          {"reference": "samba-krb5-printing"},
          {"reference": "samba-ldb-ldap-modules"},
          {"reference": "samba-libs"},
          {"reference": "samba-pidl"},
          {"reference": "samba-test"},
          {"reference": "samba-test-libs"},
          {"reference": "samba-tools"},
          {"reference": "samba-usershares"},
          {"reference": "samba-vfs-iouring"},
          {"reference": "samba-winbind"},
          {"reference": "samba-winbind-clients"},
          {"reference": "samba-winbind-krb5-locator"},
          {"reference": "samba-winbind-modules"},
          {"reference": "samba-winexe"},
          {"reference": "thunderbird"},
          {"reference": "trustee-guest-components"}
        ]
      }
    ]
  }
};

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 Sep 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.17.5
CVSS 48.7
EPSS0.00346
SSVC
3