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Fencer Vulns
medium 5.3

CVE-2019-16056 json

An issue was discovered in Python through 2.7.16, 3.x through 3.5.7, 3.6.x through 3.6.9, and 3.7.x through 3.7.4.

published 2019-09-06 7 y ago modified 2026-10-14 26 d ago also EUVD-2019-6919

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.1%
EPSS 5.1% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

An issue was discovered in Python through 2.7.16, 3.x through 3.5.7, 3.6.x through 3.6.9, and 3.7.x through 3.7.4. The email module wrongly parses email addresses that contain multiple @ characters. An application that uses the email module and implements some kind of checks on the From/To headers of a message could be tricked into accepting an email address that should be denied. An attack may be the same as in CVE-2019-11340; however, this CVE applies to Python more generally.

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • python2.7 Debian 11 2.7.17~rc1-1

debian advisories DEBIAN-CVE-2019-16056

  • python2.7 Ubuntu 16.04 LTS 2.7.12-1ubuntu0~16.04.9
  • python2.7 Ubuntu 18.04 LTS 2.7.15-4ubuntu4~18.04.2
  • python3.5 Ubuntu 16.04 LTS 3.5.2-2ubuntu0~16.04.9
  • python3.6 Ubuntu 18.04 LTS 3.6.8-1~18.04.3
  • python2.7 Ubuntu Pro 14.04 LTS 2.7.6-8ubuntu0.6+esm3
  • python3.4 Ubuntu Pro 14.04 LTS 3.4.3-1ubuntu1~14.04.7+esm4
  • python3.5 Ubuntu Pro 14.04 LTS 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1

ubuntu advisories UBUNTU-CVE-2019-16056

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • pytz RHEL 8 2017.2-12.module+el8.1.0+3111+de3f2d8e
  • babel RHEL 8 2.5.1-9.module+el8.1.0+3111+de3f2d8e
  • numpy RHEL 8 1:1.14.2-13.module+el8.1.0+3323+7ac3e00f
  • scipy RHEL 8 1.0.0-20.module+el8.1.0+3323+7ac3e00f
  • Cython RHEL 8 0.28.1-7.module+el8.1.0+3111+de3f2d8e
  • pytest RHEL 8 3.4.2-13.module+el8.1.0+3111+de3f2d8e
  • PyYAML RHEL 8 3.12-16.module+el8.1.0+3111+de3f2d8e
  • python2 RHEL 8 2.7.17-1.module+el8.2.0+4561+f4e0d66a

red hat advisories RHSA-2020:1605RHSA-2019:3725RHSA-2020:2520RHSA-2020:1764RHSA-2020:1132RHSA-2020:1131

  • python SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 2.6.9-40.32.2
  • python-base SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 2.6.9-40.32.1
  • python36 SLES for SAP 12 SP5, SLES 12 SP5 3.6.12-4.22.2
  • python36-core SLES for SAP 12 SP5, SLES 12 SP5 3.6.12-4.22.2
  • python3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 3.4.10-25.52.1
  • python3-base SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 3.4.10-25.52.1
  • python3 SLE Module for Basesystem 15 SP1 3.6.10-3.53.1
  • python3-base SLE Module for Development Tools 15 SP1, SLE Module for Basesystem 15 SP1 3.6.10-3.53.1

suse advisories SUSE-SU-2021:14198-1SUSE-SU-2020:3563-1SUSE-SU-2020:2699-1SUSE-RU-2020:1342-1SUSE-SU-2020:0302-1SUSE-SU-2020:0234-1

  • python openSUSE Tumbleweed 2.7.18-8.1
  • python36 openSUSE Tumbleweed 3.6.15-1.1
  • python3 openSUSE Leap 15.1 3.6.10-lp151.6.7.1
  • python3-base openSUSE Leap 15.1 3.6.10-lp151.6.7.1
  • python3 openSUSE Leap 15.0 3.6.9-lp150.2.14.1
  • python3-base openSUSE Leap 15.0 3.6.9-lp150.2.14.1
  • python3 openSUSE Leap 15.1 3.6.9-lp151.6.4.1
  • python3-base openSUSE Leap 15.1 3.6.9-lp151.6.4.1

opensuse advisories openSUSE-SU-2024:11202-1openSUSE-SU-2024:11284-1openSUSE-SU-2020:0086-1openSUSE-SU-2019:2453-1openSUSE-SU-2019:2438-1openSUSE-SU-2019:2393-1

  • python2-py AlmaLinux 8 1.5.3-6.module_el8.6.0+2781+fed64c13
  • python2-dns AlmaLinux 8 1.15.0-10.module_el8.6.0+2781+fed64c13
  • python2-idna AlmaLinux 8 2.5-7.module_el8.6.0+2781+fed64c13
  • python2-mock AlmaLinux 8 2.0.0-13.module_el8.6.0+2781+fed64c13
  • python2-pytz AlmaLinux 8 2017.2-12.module_el8.6.0+2781+fed64c13
  • python2-attrs AlmaLinux 8 17.4.0-10.module_el8.6.0+2781+fed64c13
  • python2-Cython AlmaLinux 8 0.28.1-7.module_el8.6.0+2781+fed64c13
  • python2-pluggy AlmaLinux 8 0.6.0-8.module_el8.6.0+2781+fed64c13

almalinux advisories ALSA-2020:1605

  • pytz Rocky Linux 8 2017.2-12.module+el8.5.0+706+735ec4b3
  • pytz Rocky Linux 8 2017.2-12.module+el8.4.0+403+9ae17a31
  • babel Rocky Linux 8 2.5.1-9.module+el8.4.0+403+9ae17a31
  • scipy Rocky Linux 8 1.0.0-20.module+el8.3.0+120+426d8baf
  • Cython Rocky Linux 8 0.28.1-7.module+el8.5.0+706+735ec4b3
  • Cython Rocky Linux 8 0.28.1-7.module+el8.4.0+403+9ae17a31
  • pytest Rocky Linux 8 3.4.2-13.module+el8.5.0+706+735ec4b3
  • pytest Rocky Linux 8 3.4.2-13.module+el8.4.0+403+9ae17a31

rocky linux advisories RLSA-2020:1605

  • python2 Alpine 3.15, Alpine 3.14, Alpine 3.13 +2 more 2.7.16-r3
  • python3 Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 3.7.5-r0
  • python3 Alpine 3.8, Alpine 3.7 3.6.8-r1
  • python3 Alpine 3.9 3.6.9-r1
  • python2-tkinter Alpine 3.11, Alpine 3.10 2.7.17-r0

alpine advisories ALPINE-CVE-2019-16056

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-16056 updated cvss 7.3

python: email.utils.parseaddr wrongly parses email addresses

  • Red Hat Enterprise Linux 5 python Red Hat Enterprise Linux 6 python, tkinter, python-libs, python-test, python-tools
    affected: no fix planned “Out of support scope”
  • Red Hat Ansible Tower 3.5 for RHEL 7 Server ansible-tower-35/ansible-tower 3.5.6-1
    fixed: vendor fix RHBA-2020:1539
  • Red Hat Ansible Tower 3.6 for RHEL 7 ansible-tower-36/ansible-tower 3.6.4-1
    fixed: vendor fix RHBA-2020:1540
  • Red Hat Enterprise Linux AppStream (v. 8) python3-idle 3.6.8-23.el8, python3-test 3.6.8-23.el8, platform-python 3.6.8-23.el8, python3-tkinter 3.6.8-23.el8, babel 2.5.1-9.module+el8.1.0+3111+de3f2d8e, pytz 2017.2-12.module+el8.1.0+3111+de3f2d8e, +88 more
    fixed: vendor fix RHSA-2020:1605
  • Red Hat Enterprise Linux BaseOS (v. 8) python3 3.6.8-23.el8, python3-libs 3.6.8-23.el8, python3-test 3.6.8-23.el8, platform-python 3.6.8-23.el8
    fixed: vendor fix RHSA-2020:1764
  • Red Hat Enterprise Linux Client (v. 7) python 2.7.5-88.el7, python3 3.6.8-13.el7, python-libs 2.7.5-88.el7, python3-libs 3.6.8-13.el7 Red Hat Enterprise Linux Client Optional (v. 7) python3 3.6.8-13.el7, tkinter 2.7.5-88.el7, python-test 2.7.5-88.el7, python-tools 2.7.5-88.el7, python3-idle 3.6.8-13.el7, python3-test 3.6.8-13.el7, +1 more Red Hat Enterprise Linux ComputeNode (v. 7) python 2.7.5-88.el7, python3 3.6.8-13.el7, python-libs 2.7.5-88.el7, python3-libs 3.6.8-13.el7
    fixed: vendor fix RHSA-2020:1131
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) python 2.7.5-87.el7_7, python-libs 2.7.5-87.el7_7
    fixed: vendor fix RHSA-2020:2520
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) python3 3.6.8-13.el7, tkinter 2.7.5-88.el7, python-test 2.7.5-88.el7, python-tools 2.7.5-88.el7, python3-idle 3.6.8-13.el7, python3-test 3.6.8-13.el7, +1 more
    fixed: vendor fix RHSA-2020:1131
show 8 more
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) tkinter 2.7.5-87.el7_7, python-test 2.7.5-87.el7_7, python-tools 2.7.5-87.el7_7
    fixed: vendor fix RHSA-2020:2520
  • Red Hat Enterprise Linux Server (v. 7) python 2.7.5-88.el7, python3 3.6.8-13.el7, python-libs 2.7.5-88.el7, python3-libs 3.6.8-13.el7
    fixed: vendor fix RHSA-2020:1131
  • Red Hat Enterprise Linux Server EUS (v. 7.7) python 2.7.5-87.el7_7, python-libs 2.7.5-87.el7_7
    fixed: vendor fix RHSA-2020:2520
  • Red Hat Enterprise Linux Server Optional (v. 7) python3 3.6.8-13.el7, tkinter 2.7.5-88.el7, python-test 2.7.5-88.el7, python-tools 2.7.5-88.el7, python3-idle 3.6.8-13.el7, python3-test 3.6.8-13.el7, +1 more
    fixed: vendor fix RHSA-2020:1131
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) tkinter 2.7.5-87.el7_7, python-test 2.7.5-87.el7_7, python-tools 2.7.5-87.el7_7
    fixed: vendor fix RHSA-2020:2520
  • Red Hat Enterprise Linux Workstation (v. 7) python 2.7.5-88.el7, python3 3.6.8-13.el7, python-libs 2.7.5-88.el7, python3-libs 3.6.8-13.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) python3 3.6.8-13.el7, tkinter 2.7.5-88.el7, python-test 2.7.5-88.el7, python-tools 2.7.5-88.el7, python3-idle 3.6.8-13.el7, python3-test 3.6.8-13.el7, +1 more
    fixed: vendor fix RHSA-2020:1131
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) python27-python 2.7.17-2.el6, python27-tkinter 2.7.17-2.el6, rh-python36-python 3.6.9-2.el6, python27-python-libs 2.7.17-2.el6, python27-python-test 2.7.17-2.el6, python27-python-tools 2.7.17-2.el6, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) python27-python 2.7.17-2.el7, python27-tkinter 2.7.17-2.el7, rh-python36-python 3.6.9-2.el7, python27-python-libs 2.7.17-2.el7, python27-python-test 2.7.17-2.el7, python27-python-tools 2.7.17-2.el7, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) python27-python 2.7.17-2.el7, python27-tkinter 2.7.17-2.el7, rh-python36-python 3.6.9-2.el7, python27-python-libs 2.7.17-2.el7, python27-python-test 2.7.17-2.el7, python27-python-tools 2.7.17-2.el7, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) python27-python 2.7.17-2.el7, python27-tkinter 2.7.17-2.el7, rh-python36-python 3.6.9-2.el7, python27-python-libs 2.7.17-2.el7, python27-python-test 2.7.17-2.el7, python27-python-tools 2.7.17-2.el7, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) python27-python 2.7.17-2.el7, python27-tkinter 2.7.17-2.el7, rh-python36-python 3.6.9-2.el7, python27-python-libs 2.7.17-2.el7, python27-python-test 2.7.17-2.el7, python27-python-tools 2.7.17-2.el7, +4 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) python27-python 2.7.17-2.el6, python27-tkinter 2.7.17-2.el6, rh-python36-python 3.6.9-2.el6, python27-python-libs 2.7.17-2.el6, python27-python-test 2.7.17-2.el6, python27-python-tools 2.7.17-2.el6, +4 more
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) python27-python 2.7.17-2.el7, python27-tkinter 2.7.17-2.el7, rh-python36-python 3.6.9-2.el7, python27-python-libs 2.7.17-2.el7, python27-python-test 2.7.17-2.el7, python27-python-tools 2.7.17-2.el7, +4 more
    fixed: vendor fix RHSA-2019:3948
  • Red Hat Enterprise Linux 8 scipy, python36, python-nose, python-wheel, python3-bson, python3-nose, +19 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 7.5

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
32 d ago

Exploit prediction

5.12% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.