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Fencer Intel
medium 6.2

CVE-2020-10735 json

A flaw was found in python.

published 4y ago modified 26d ago also BIT-libpython-2020-10735 , BIT-python-2020-10735 , BIT-python-min-2020-10735 , EUVD-2020-3159

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.5%
EPSS 4.5% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

A flaw was found in python. In algorithms with quadratic time complexity using non-binary bases, when using int("text"), a system could take 50ms to parse an int string with 100,000 digits and 5s for 1,000,000 digits (float, decimal, int.from_bytes(), and int() for binary bases 2, 4, 8, 16, and 32 are not affected). The highest threat from this vulnerability is to system availability.

Patch / fix

  • bitnami libpython 3.7.14, 3.8.14, 3.9.14, 3.10.7
  • bitnami python 3.7.14, 3.8.14, 3.9.14, 3.10.7
  • bitnami python-min 3.7.14, 3.8.14, 3.9.14, 3.10.7
  • 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
  • pypy3 Debian 14, Debian 13, Debian 12 7.3.10+dfsg-1
  • python3.11 Debian 12 3.11.0~rc2-1

debian advisories DEBIAN-CVE-2020-10735

  • numpy RHEL 8 1.19.4-3.module+el8.5.0+12204+54860423
  • scipy RHEL 8 1.5.4-3.module+el8.4.0+9822+20bf1249
  • Cython RHEL 8 0.29.21-5.module+el8.4.0+9822+20bf1249
  • pytest RHEL 8 6.0.2-2.module+el8.4.0+9822+20bf1249
  • PyYAML RHEL 8 5.4.1-1.module+el8.5.0+10613+59a13ec4
  • mod_wsgi RHEL 8 4.7.1-5.module+el8.7.0+16654+645aad7f
  • pybind11 RHEL 8 2.7.1-1.module+el8.6.0+12838+640e6226
  • python39 RHEL 8 3.9.16-1.module+el8.8.0+17625+b531f198

red hat advisories RHSA-2024:0430RHSA-2023:2764RHSA-2023:2763RHSA-2023:0833RHSA-2022:7323RHSA-2022:6766

  • python3 SLE Module for Basesystem 15 SP4, SLE Module for Basesystem 15 SP3, SLE Micro 5.3 +5 more 3.6.15-150300.10.37.2
  • python3-core SLE Module for Development Tools 15 SP4, SLE Module for Development Tools 15 SP3, SLE Module for Basesystem 15 SP4 +7 more 3.6.15-150300.10.37.2
  • python3-documentation openSUSE Leap 15.4, openSUSE Leap 15.3 3.6.15-150300.10.37.1
  • python36 SLES for SAP 12 SP5, SLES 12 SP5 3.6.15-32.2
  • python36-core SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 3.6.15-32.2
  • python3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +7 more 3.4.10-25.102.2
  • python3-base SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +7 more 3.4.10-25.102.2
  • python3 SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +17 more 3.6.15-150000.3.116.1

suse advisories SUSE-SU-2022:4281-1SUSE-SU-2022:4274-1SUSE-SU-2022:4251-1SUSE-SU-2022:3924-1SUSE-SU-2022:3485-1SUSE-SU-2022:3473-1

  • python315 openSUSE Tumbleweed 3.15.0~a1-1.1
  • python-pydantic openSUSE Tumbleweed 2.10.6-1.1
  • python314 openSUSE Tumbleweed 3.14.0~a1-1.1
  • python313 openSUSE Tumbleweed 3.13.0~b3-1.1
  • python311 openSUSE Tumbleweed 3.11.0rc2-1.1
  • python310 openSUSE Tumbleweed 3.10.7-1.2
  • python38 openSUSE Tumbleweed 3.8.14-1.1
  • python39 openSUSE Tumbleweed 3.9.14-1.1

opensuse advisories openSUSE-SU-2025:15713-1openSUSE-SU-2025:14712-1openSUSE-SU-2024:14434-1openSUSE-SU-2024:14109-1openSUSE-SU-2024:12336-1openSUSE-SU-2024:12340-1

  • python38 AlmaLinux 8 3.8.16-1.module_el8.8.0+3482+d5d93a3e
  • python38-py AlmaLinux 8 1.8.0-8.module_el8.6.0+2778+cd494b30
  • python38-pip AlmaLinux 8 19.3.1-6.module_el8.7.0+3344+99a6a656
  • python38-ply AlmaLinux 8 3.11-10.module_el8.6.0+2778+cd494b30
  • python38-six AlmaLinux 8 1.12.0-10.module_el8.6.0+2778+cd494b30
  • python38-cffi AlmaLinux 8 1.13.2-3.module_el8.6.0+2778+cd494b30
  • python38-cffi AlmaLinux 8 1.13.2-3.module_el8.6.0+3163+f4472775
  • python38-idle AlmaLinux 8 3.8.16-1.module_el8.8.0+3482+d5d93a3e

almalinux advisories ALSA-2023:2763ALSA-2023:2764ALSA-2023:0833ALSA-2022:7323

  • babel Rocky Linux 8 2.7.0-11.module+el8.9.0+1418+f0d66789
  • Cython Rocky Linux 8 0.29.14-4.module+el8.9.0+1418+f0d66789
  • pytest Rocky Linux 8 4.6.6-3.module+el8.9.0+1418+f0d66789
  • PyYAML Rocky Linux 8 5.4.1-1.module+el8.9.0+1418+f0d66789
  • PyYAML Rocky Linux 8 5.4.1-1.module+el8.10.0+1582+bc278001
  • PyYAML Rocky Linux 8 5.4.1-1.module+el8.10.0+1860+afcc1c71
  • python-py Rocky Linux 8 1.8.0-8.module+el8.9.0+1418+f0d66789
  • python-ply Rocky Linux 8 3.11-10.module+el8.9.0+1418+f0d66789

rocky linux advisories RLSA-2023:2763RLSA-2023:2764RLSA-2023:0833RLSA-2022:7323

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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-2020-10735 updated cvss 7.5

python: int() type in PyLong_FromString() does not limit amount of digits converting text to int leading to DoS

  • Red Hat Enterprise Linux 5 python Red Hat Enterprise Linux 6 python, tkinter, python-libs, python-test, python-tools Red Hat Enterprise Linux 7 python, python3, tkinter, python-libs, python-test, python-tools, +4 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 python2, python2-libs, python2-test, python2-tools, python2-tkinter
    affected: no fix planned “Will not fix”
  • Red Hat Quay 3 quay
    affected: no fix available
  • Red Hat Software Collections python27-python, python27-tkinter, python27-python-libs, python27-python-test, python27-python-tools
    affected: no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 9) python3 3.9.10-3.el9_0, python3-idle 3.9.10-3.el9_0, python3-test 3.9.10-3.el9_0, python3-tkinter 3.9.10-3.el9_0
    fixed: vendor fix RHSA-2022:7323
  • Red Hat Enterprise Linux AppStream (v. 8) python3-idle 3.6.8-48.el8_7.1, python3-test 3.6.8-48.el8_7.1, platform-python 3.6.8-48.el8_7.1, python3-tkinter 3.6.8-48.el8_7.1, pytz 2019.3-3.module+el8.4.0+8888+89bc7e79, scipy 1.3.1-4.module+el8.4.0+8888+89bc7e79, +118 more
    fixed: vendor fix RHSA-2023:0833
  • Red Hat Enterprise Linux AppStream (v. 9) python3-tkinter 3.9.10-3.el9_0, python-unversioned-command 3.9.10-3.el9_0
    fixed: vendor fix RHSA-2022:7323
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) python3-idle 3.6.8-47.el8_6.4, python3-test 3.6.8-47.el8_6.4, platform-python 3.6.8-47.el8_6.4, python3-tkinter 3.6.8-47.el8_6.4
    fixed: vendor fix RHSA-2024:0430
show 6 more
  • Red Hat Enterprise Linux BaseOS (v. 8) python3 3.6.8-48.el8_7.1, python3-libs 3.6.8-48.el8_7.1, python3-test 3.6.8-48.el8_7.1, platform-python 3.6.8-48.el8_7.1
    fixed: vendor fix RHSA-2023:0833
  • Red Hat Enterprise Linux BaseOS (v. 9) python3 3.9.10-3.el9_0, python3.9 3.9.10-3.el9_0, python3-libs 3.9.10-3.el9_0
    fixed: vendor fix RHSA-2022:7323
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) python3 3.6.8-47.el8_6.4, python3-libs 3.6.8-47.el8_6.4, python3-test 3.6.8-47.el8_6.4, platform-python 3.6.8-47.el8_6.4
    fixed: vendor fix RHSA-2024:0430
  • Red Hat Enterprise Linux CRB (v. 8) pytest 4.6.6-3.module+el8.4.0+8888+89bc7e79, pytest 6.0.2-2.module+el8.4.0+9822+20bf1249, Cython 0.29.21-5.module+el8.4.0+9822+20bf1249, pybind11 2.7.1-1.module+el8.6.0+12838+640e6226, python-py 1.8.0-8.module+el8.4.0+8888+89bc7e79, python-py 1.10.0-1.module+el8.4.0+9822+20bf1249, +34 more
    fixed: vendor fix RHSA-2023:2763
  • Red Hat Software Collections for RHEL Workstation(v. 7) rh-python38-python 3.8.14-1.el7, rh-python38-python-idle 3.8.14-1.el7, rh-python38-python-libs 3.8.14-1.el7, rh-python38-python-test 3.8.14-1.el7, rh-python38-python-tkinter 3.8.14-1.el7, rh-python38-python-rpm-macros 3.8.14-1.el7, +1 more Red Hat Software Collections for RHEL(v. 7) rh-python38-python 3.8.14-1.el7, rh-python38-python-idle 3.8.14-1.el7, rh-python38-python-libs 3.8.14-1.el7, rh-python38-python-test 3.8.14-1.el7, rh-python38-python-tkinter 3.8.14-1.el7, rh-python38-python-rpm-macros 3.8.14-1.el7, +1 more
    fixed: vendor fix RHSA-2022:6766
  • Red Hat Enterprise Linux 8 numpy, scipy, PyYAML, mod_wsgi, python36, python39, +71 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 ICSA-24-046-11 updated cvss 7.5

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 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
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

4.54% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami libpython
>=3.7.0, <3.7.14
>=3.8.0, <3.8.14
>=3.9.0, <3.9.14
>=3.10.0, <3.10.7
3.7.14
3.8.14
3.9.14
3.10.7
bitnami python
>=3.7.0, <3.7.14
>=3.8.0, <3.8.14
>=3.9.0, <3.9.14
>=3.10.0, <3.10.7
3.7.14
3.8.14
3.9.14
3.10.7
bitnami python-min
>=3.7.0, <3.7.14
>=3.8.0, <3.8.14
>=3.9.0, <3.9.14
>=3.10.0, <3.10.7
3.7.14
3.8.14
3.9.14
3.10.7

Affected products

  • n/a python
  • 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-704 Incorrect Type Conversion or Cast

References

Sources

Fencer Intel 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.