Medium severity · published Sep 30, 2020
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…
6.5
CVSS
2.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 83% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
DL
Debian Linux · Debian
9.0 · source: NVD
UL
Ubuntu Linux · Canonical
16.04; 18.04; 20.04 · source: NVD
UR
Urllib3 · Python
before 1.25.9 · source: NVD
ZS
Zfs Storage Appliance Kit · Oracle
8.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26137
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-26137
Issue Tracking
https://bugs.python.org/issue39603
Patch
https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b
Patch
https://github.com/urllib3/urllib3/pull/1800
Mailing List
https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
lists.debian.org
https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html
Third Party Advisory
https://usn.ubuntu.com/4570-1/
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