CVE-2020-26116
CVSS v3
7.2
HIGH
EPSS Score
6.4 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
http.client in Python 3.x before 3.5.10, 3.6.x before 3.6.12, 3.7.x before 3.7.9, and 3.8.x before 3.8.5 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 HTTPConnection.request.
Technical details
- Published
- 2020-09-27
Frequently asked questions
What is CVE-2020-26116?
http.client in Python 3.x before 3.5.10, 3.6.x before 3.6.12, 3.7.x before 3.7.9, and 3.8.x before 3.8.5 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 HTTPConnection.request.
Is CVE-2020-26116 actively exploited?
Active exploitation of CVE-2020-26116 has not been confirmed. Its EPSS score was 6.4% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2020-26116?
CVE-2020-26116 has a CVSS v3 base score of 7.2 (HIGH severity).
Is CVE-2020-26116 affecting your environment?
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