medium
6.5
CWE
74 93 113
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2020-26137: CRLF Injection

First published: Mon Feb 10 2020(Updated: )

A flaw was found in python-urllib3. The HTTPConnection.request() does not properly validate CRLF sequences in the HTTP request method, potentially allowing manipulation of the request by injecting additional HTTP headers. The highest threat from this vulnerability is to confidentiality and integrity.

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/python<0:2.7.5-92.el7_9
0:2.7.5-92.el7_9
redhat/python-urllib3<0:1.24.2-5.el8
0:1.24.2-5.el8
redhat/python-urllib3<0:1.26.2-1.el7
0:1.26.2-1.el7
redhat/rh-python38-python<0:3.8.6-1.el7
0:3.8.6-1.el7
redhat/rh-python38-python-psutil<0:5.6.4-5.el7
0:5.6.4-5.el7
redhat/rh-python38-python-urllib3<0:1.25.7-6.el7
0:1.25.7-6.el7
redhat/urllib3<1.25.9
1.25.9
pip/urllib3<1.25.9
1.25.9
debian/python-urllib3
1.26.5-1~exp1
1.26.5-1~exp1+deb11u1
1.26.12-1
2.2.3-4
Python 3 urllib3<1.25.9
Ubuntu Linux=16.04
Ubuntu Linux=18.04
Ubuntu Linux=20.04
Debian GNU/Linux=9.0
oracle communications cloud native core network function cloud native environment=22.2.0
Oracle Sun ZFS Storage Appliance Kit=8.8
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=20.04
Debian=9.0
IBM QRadar Security Information and Event Manager<=7.5 - 7.5.0 UP9 IF03
IBM Security QRadar Incident Forensics<=7.5 - 7.5.0 UP9 IF03

Remedy

https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b

Remedy

https://github.com/urllib3/urllib3/pull/1800

Remedy

https://www.oracle.com/security-alerts/cpujul2022.html

Remedy

https://www.oracle.com/security-alerts/cpuoct2021.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-26137?

    CVE-2020-26137 is a vulnerability in urllib3 library that allows CRLF injection if the attacker controls the HTTP request method.

  • What is the severity of CVE-2020-26137?

    The severity of CVE-2020-26137 is high, with a CVSS score of 7.4.

  • How does CVE-2020-26137 impact confidentiality and integrity?

    CVE-2020-26137 can potentially impact confidentiality and integrity of the affected system.

  • Which software versions are affected by CVE-2020-26137?

    Versions up to and excluding urllib3 1.25.9 are affected by CVE-2020-26137.

  • What is the remedy for CVE-2020-26137?

    The remedy for CVE-2020-26137 is to update urllib3 to version 1.25.9 or later.

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