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Ubuntu 16.04 LTS / 20.04 LTS : Python vulnerabilities (USN-8744-1)

🗓️ 11 Sep 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 3 Views

Multiple Python vulnerabilities in Ubuntu 16.04/20.04 LTS enable DoS, injection, and filter bypass.

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Code
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attackerkb
ATTACKERKB		CVE-2026-15308
9 Jul 202617:10
–attackerkb
attackerkb
ATTACKERKB		CVE-2026-3644
16 Mar 202617:37
–attackerkb
attackerkb
ATTACKERKB		CVE-2026-4360
30 Jun 202614:45
–attackerkb
attackerkb
ATTACKERKB		CVE-2026-4224
16 Mar 202617:52
–attackerkb
Rows per page
#%NASL_MIN_LEVEL 80900
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# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8744-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
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##

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if (description)
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  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/11");

  script_cve_id(
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    "CVE-2026-4224",
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"The remote Ubuntu 16.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-8744-1 advisory.

    It was discovered that Python's http.cookies module incorrectly handled control characters in certain
    cookie operations. An attacker could possibly use this issue to inject arbitrary content. This issue only
    affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and
    Ubuntu 24.04 LTS. (CVE-2026-3644)

    It was discovered that the Python pyexpat module was vulnerable to unbounded recursion in the Expat XML
    parser. An attacker could possibly use this issue to cause Python to crash, resulting in a denial of
    service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,
    Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-4224)

    It was discovered that Python's tarfile module did not correctly apply the filter parameter when
    extracting hard links. An attacker could possibly use this issue to cause files to be extracted with an
    unexpected uid or gid, bypassing the restrictions requested via filter='data'. (CVE-2026-4360)

    It was discovered that Python's http.cookies module incorrectly escaped values in the js_output() method.
    An attacker could possibly use this issue to inject arbitrary JavaScript. (CVE-2026-6019)

    It was discovered that Python's html.parser module incorrectly handled repeated unterminated markup
    declarations. An attacker could possibly use this issue to cause Python to consume excessive CPU
    resources, leading to a denial of service. (CVE-2026-15308)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
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include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('16.04' >< os_release || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 20.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '16.04', 'pkgname': 'idle-python2.7', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm22', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'idle-python3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'libpython2.7', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm22', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'libpython2.7-minimal', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm22', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'libpython2.7-stdlib', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm22', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'libpython2.7-testsuite', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm22', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'libpython3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'libpython3.5-minimal', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'libpython3.5-stdlib', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'libpython3.5-testsuite', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'python2.7', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm22', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'python2.7-examples', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm22', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'python2.7-minimal', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm22', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'python3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'python3.5-examples', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'python3.5-minimal', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '16.04', 'pkgname': 'python3.5-venv', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm25', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'idle-python2.7', 'pkgver': '2.7.18-1~20.04.7+esm10', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'idle-python3.8', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'idle-python3.9', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython2.7', 'pkgver': '2.7.18-1~20.04.7+esm10', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython2.7-minimal', 'pkgver': '2.7.18-1~20.04.7+esm10', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython2.7-stdlib', 'pkgver': '2.7.18-1~20.04.7+esm10', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
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    {'osver': '20.04', 'pkgname': 'libpython3.8-minimal', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython3.8-stdlib', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython3.8-testsuite', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython3.9', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython3.9-minimal', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython3.9-stdlib', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'libpython3.9-testsuite', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python2.7', 'pkgver': '2.7.18-1~20.04.7+esm10', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python2.7-examples', 'pkgver': '2.7.18-1~20.04.7+esm10', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python2.7-minimal', 'pkgver': '2.7.18-1~20.04.7+esm10', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.8', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.8-examples', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.8-full', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.8-minimal', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.8-venv', 'pkgver': '3.8.10-0ubuntu1~20.04.18+esm7', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.9', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.9-examples', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.9-full', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.9-minimal', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']},
    {'osver': '20.04', 'pkgname': 'python3.9-venv', 'pkgver': '3.9.5-3ubuntu0~20.04.1+esm11', 'cves': ['CVE-2026-3644', 'CVE-2026-4224', 'CVE-2026-4360', 'CVE-2026-6019', 'CVE-2026-15308']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'idle-python2.7 / idle-python3.5 / idle-python3.8 / idle-python3.9 / etc');
}

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11 Sep 2026 00:00Current
CVSS 3.17.5
CVSS 48.7
EPSS0.0069
SSVC
PythonUbuntu LTShttp.cookiespyexpattarfileDenial of ServiceInjection
3