CVE-2020-26137

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: this is similar to CVE-2020-26116.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.23%
Vendor Advisory ubuntu.com Vendor Advisory python.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://bugs.python.org/issue39603 vendor advisory issue tracking
https://github.com/urllib3/urllib3/pull/1800 third party advisory patch
https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b third party advisory patch
https://usn.ubuntu.com/4570-1/ third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html third party advisory mailing list
https://www.oracle.com/security-alerts/cpuoct2021.html third party advisory patch
https://www.oracle.com/security-alerts/cpujul2022.html third party advisory patch
https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html mailing list

Frequently Asked Questions

What is the severity of CVE-2020-26137?
CVE-2020-26137 has been scored as a medium severity vulnerability.
How to fix CVE-2020-26137?
To fix CVE-2020-26137, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-26137 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-26137 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.