synced 11 MIN AGO
01 Record

CVE-2020-26137

urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE:

UnratedPUBLISHEDCNA: mitre
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE:

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
2.26% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 82.5% of scored records. A rank, not a probability.
NVD base score
6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2020-09-29 00:00Z6 YR AGO
Last updated
2024-08-04 15:49Z2 YR AGO
Reserved
2020-09-29
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class
  • CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')Variant
Data version
5.1
Document digest
553fdcfb76d3021dfb5c9e40e992342b8c5ade1caf5420f0f785a2b203fc4bbe

05 Affected products

VendorProductVersionsPlatforms
canonicalubuntu_linuxNot specified—
debiandebian_linuxNot specified—
oraclecommunications_cloud_native_core_network_function_cloud_native_environmentNot specified—
oraclezfs_storage_appliance_kitNot specified—
pythonurllib3Not specified—
redhatenterprise_linuxNot specified—
redhatopenshiftNot specified—
redhatopenstackNot specified—
redhatrhel_software_collectionsNot specified—
redhatstorageNot specified—

06 References

07 Fixed in

AlmaLinux 8

  • python-psycopg2-doc
    Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
  • python-sqlalchemy-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.3.2-2.module_el8.5.0+2569+5c5719bc
    • Affected before 1.3.2-2.module_el8.6.0+2781+fed64c13
  • python2-Cython
    Fixed in 0.28.1-7.module_el8.6.0+2781+fed64c13
  • python2-PyMySQL
    Fixed in 0.8.0-10.module_el8.6.0+2781+fed64c13
  • python2-attrs
    Fixed in 17.4.0-10.module_el8.6.0+2781+fed64c13
  • python2-backports
    Fixed in 1.0-16.module_el8.6.0+2781+fed64c13
  • python2-backports-ssl_match_hostname
    Fixed in 3.5.0.1-12.module_el8.6.0+2781+fed64c13
  • python2-chardet
    Fixed in 3.0.4-10.module_el8.6.0+2781+fed64c13
  • python2-coverage
    Fixed in 4.5.1-4.module_el8.6.0+2781+fed64c13
  • python2-dns
    Fixed in 1.15.0-10.module_el8.6.0+2781+fed64c13
  • python2-docs
    Fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13
  • python2-docs-info
    Fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13
  • python2-docutils
    Fixed in 0.14-12.module_el8.6.0+2781+fed64c13
  • python2-funcsigs
    Fixed in 1.0.2-13.module_el8.6.0+2781+fed64c13
  • python2-idna
    Fixed in 2.5-7.module_el8.6.0+2781+fed64c13
  • python2-ipaddress
    Fixed in 1.0.18-6.module_el8.6.0+2781+fed64c13
  • python2-markupsafe
    Fixed in 0.23-19.module_el8.6.0+2781+fed64c13
  • python2-mock
    Fixed in 2.0.0-13.module_el8.6.0+2781+fed64c13
  • python2-numpy
    Fixed in 1:1.14.2-16.module_el8.6.0+2781+fed64c13
  • python2-numpy-doc
    Fixed in 1:1.14.2-16.module_el8.6.0+2781+fed64c13
  • python2-numpy-f2py
    Fixed in 1:1.14.2-16.module_el8.6.0+2781+fed64c13
  • python2-pluggy
    Fixed in 0.6.0-8.module_el8.6.0+2781+fed64c13
  • python2-psycopg2
    Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
  • python2-psycopg2-debug
    Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
  • python2-psycopg2-tests
    Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
  • python2-py
    Fixed in 1.5.3-6.module_el8.6.0+2781+fed64c13
  • python2-pysocks
    Fixed in 1.6.8-6.module_el8.6.0+2781+fed64c13
  • python2-pytest
    Fixed in 3.4.2-13.module_el8.6.0+2781+fed64c13
  • python2-pytest-mock
    Fixed in 1.9.0-4.module_el8.6.0+2781+fed64c13
  • python2-pytz
    Fixed in 2017.2-12.module_el8.6.0+2781+fed64c13
  • python2-pyyaml
    Fixed in 3.12-16.module_el8.6.0+2781+fed64c13
  • python2-requests
    Fixed in 2.20.0-3.module_el8.6.0+2781+fed64c13
  • python2-rpm-macros
    Fixed in 3-38.module_el8.6.0+2781+fed64c13
  • python2-setuptools
    Fixed in 39.0.1-13.module_el8.6.0+2781+fed64c13
  • python2-setuptools-wheel
    Fixed in 39.0.1-13.module_el8.6.0+2781+fed64c13
  • python2-setuptools_scm
    Fixed in 1.15.7-6.module_el8.6.0+2781+fed64c13
  • python2-six
    Fixed in 1.11.0-6.module_el8.6.0+2781+fed64c13
  • python2-sqlalchemy
    Fixed in 1.3.2-2.module_el8.6.0+2781+fed64c13
  • python2-urllib3
    Fixed in 1.24.2-3.module_el8.6.0+2781+fed64c13
  • python3-urllib3
    Fixed in 1.24.2-5.el8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • python-psycopg2-doc
    Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
  • python-sqlalchemy-doc
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.3.2-2.module_el8.5.0+2569+5c5719bc
    • Affected before 1.3.2-2.module_el8.6.0+2781+fed64c13
  • python2-Cython
    Fixed in 0.28.1-7.module_el8.6.0+2781+fed64c13
  • python2-PyMySQL
    Fixed in 0.8.0-10.module_el8.6.0+2781+fed64c13
  • python2-attrs
    Fixed in 17.4.0-10.module_el8.6.0+2781+fed64c13
  • python2-backports
    Fixed in 1.0-16.module_el8.6.0+2781+fed64c13
  • python2-backports-ssl_match_hostname
    Fixed in 3.5.0.1-12.module_el8.6.0+2781+fed64c13
  • python2-chardet
    Fixed in 3.0.4-10.module_el8.6.0+2781+fed64c13
  • python2-coverage
    Fixed in 4.5.1-4.module_el8.6.0+2781+fed64c13
  • python2-dns
    Fixed in 1.15.0-10.module_el8.6.0+2781+fed64c13
  • python2-docs
    Fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13
  • python2-docs-info
    Fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13
  • python2-docutils
    Fixed in 0.14-12.module_el8.6.0+2781+fed64c13
  • python2-funcsigs
    Fixed in 1.0.2-13.module_el8.6.0+2781+fed64c13
  • python2-idna
    Fixed in 2.5-7.module_el8.6.0+2781+fed64c13
  • python2-ipaddress
    Fixed in 1.0.18-6.module_el8.6.0+2781+fed64c13
  • python2-markupsafe
    Fixed in 0.23-19.module_el8.6.0+2781+fed64c13
  • python2-mock
    Fixed in 2.0.0-13.module_el8.6.0+2781+fed64c13
  • python2-numpy
    Fixed in 1:1.14.2-16.module_el8.6.0+2781+fed64c13
  • python2-numpy-doc
    Fixed in 1:1.14.2-16.module_el8.6.0+2781+fed64c13
  • python2-numpy-f2py
    Fixed in 1:1.14.2-16.module_el8.6.0+2781+fed64c13
  • python2-pluggy
    Fixed in 0.6.0-8.module_el8.6.0+2781+fed64c13
  • python2-psycopg2
    Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
  • python2-psycopg2-debug
    Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
  • python2-psycopg2-tests
    Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
  • python2-py
    Fixed in 1.5.3-6.module_el8.6.0+2781+fed64c13
  • python2-pysocks
    Fixed in 1.6.8-6.module_el8.6.0+2781+fed64c13
  • python2-pytest
    Fixed in 3.4.2-13.module_el8.6.0+2781+fed64c13
  • python2-pytest-mock
    Fixed in 1.9.0-4.module_el8.6.0+2781+fed64c13
  • python2-pytz
    Fixed in 2017.2-12.module_el8.6.0+2781+fed64c13
  • python2-pyyaml
    Fixed in 3.12-16.module_el8.6.0+2781+fed64c13
  • python2-requests
    Fixed in 2.20.0-3.module_el8.6.0+2781+fed64c13
  • python2-rpm-macros
    Fixed in 3-38.module_el8.6.0+2781+fed64c13
  • python2-setuptools
    Fixed in 39.0.1-13.module_el8.6.0+2781+fed64c13
  • python2-setuptools-wheel
    Fixed in 39.0.1-13.module_el8.6.0+2781+fed64c13
  • python2-setuptools_scm
    Fixed in 1.15.7-6.module_el8.6.0+2781+fed64c13
  • python2-six
    Fixed in 1.11.0-6.module_el8.6.0+2781+fed64c13
  • python2-sqlalchemy
    Fixed in 1.3.2-2.module_el8.6.0+2781+fed64c13
  • python2-urllib3
    Fixed in 1.24.2-3.module_el8.6.0+2781+fed64c13
  • python3-urllib3
    Fixed in 1.24.2-5.el8

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • python-urllib3
    Fixed in 1.25.9-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • python-urllib3
    Fixed in 1.25.9-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • python-urllib3
    Fixed in 1.25.9-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • python-pip
    Fixed in 8.1.1-2ubuntu0.6
  • python-urllib3
    Fixed in 1.13.1-2ubuntu0.16.04.4

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • python-pip
    Fixed in 9.0.1-2.3~ubuntu1.18.04.3
  • python-urllib3
    Fixed in 1.22-1ubuntu0.18.04.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • python-pip
    Fixed in 20.0.2-5ubuntu1.1
  • python-urllib3
    Fixed in 1.25.8-2ubuntu0.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • python-pip
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.