Vulnerability · 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 reques…
Published Sep 27, 2020 · catalog updated Oct 14, 2026 · the affected product
Check if you run it
No confirmed exploitation is on record for CVE-2020-26116. EPSS is 6.36%. Act only if a listed version of the affected product is installed.
Gaps on this record
- No plain product name is stored. The page cannot tell you which product to check.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.2
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 6.36%
- Remediation
- Advisory link
- Affected products
- cpe canonical/ubuntu linux · cpe debian/debian linux · cpe fedoraproject/fedora · cpe netapp/solidfire · cpe opensuse/leap · cpe oracle/zfs storage appliance kit
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe canonical/ubuntu linux12.04
- cpe debian/debian linux9.0
- cpe fedoraproject/fedora31
- cpe fedoraproject/fedora32
- cpe fedoraproject/fedora33
- cpe netapp/solidfireversion unspecified
- cpe opensuse/leap15.1
- cpe oracle/zfs storage appliance kit8.8
- cpe python/pythonversion unspecified
How to fix CVE-2020-26116
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2020-26116. EPSS is 6.36%. Act only if a listed version of the affected product is installed.
Which versions are affected?
Compare what you have installed with canonical/ubuntu linux 12.04; debian/debian linux 9.0; oracle/zfs storage appliance kit 8.8. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-74: Injection. EPSS 6.36%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 27, 2020 · NIST NVD
Detected
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.
Oct 14, 2026 · NIST NVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2020-26116
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2020-26116
30-day exploitation probability 6.4%
first.org - NIST NVDVulnerability recordCVE-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.reque
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.