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 Software | Affected Version | How 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 |
| Python urllib3 | <1.25.9 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =20.04 | |
| Debian Debian Linux | =9.0 | |
| Oracle Communications Cloud Native Core Network Function Cloud Native Environment | =22.2.0 | |
| Oracle ZFS Storage Appliance Kit | =8.8 | |
| redhat/urllib3 | <1.25.9 | 1.25.9 |
| IBM Concert Software | <=1.0.0 - 1.0.1 | |
| pip/urllib3 | <1.25.9 | 1.25.9 |
| debian/python-urllib3 | 1.26.5-1~exp1 1.26.12-1 2.2.3-4 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2020-26137 https://nvd.nist.gov/vuln/detail/CVE-2020-26137
- https://bugzilla.redhat.com/show_bug.cgi?id=1883632
- https://access.redhat.com/errata/RHSA-2022:5235
- https://access.redhat.com/errata/RHSA-2021:1761
- https://access.redhat.com/errata/RHSA-2021:1631
- https://access.redhat.com/errata/RHSA-2021:0079
- https://access.redhat.com/errata/RHSA-2021:0034
- https://access.redhat.com/errata/RHSA-2020:4299
- https://access.redhat.com/security/cve/cve-2020-26137
- https://bugs.python.org/issue39603
- https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b
- https://github.com/urllib3/urllib3/pull/1800
- https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html
- https://usn.ubuntu.com/4570-1/
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://nvd.nist.gov/vuln/detail/CVE-2020-26137
- https://github.com/advisories/GHSA-wqvq-5m8c-6g24 (Advisory)
- https://launchpad.net/bugs/cve/CVE-2020-26137
- https://access.redhat.com/security/cve/CVE-2020-26116
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1883871
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1883873
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1883872
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1883870
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1883876
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1883632#c13
- https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2020-bd6a96cd24
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1887224
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1883632#c26
- https://security-tracker.debian.org/tracker/CVE-2020-26137
- https://www.ibm.com/support/pages/node/7173596 (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-148.yaml
- https://usn.ubuntu.com/4570-1
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26137
- https://ubuntu.com/security/CVE-2020-26137
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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