CVE-2020-26116
HIGHCVSS 7.2/10EPSS 6.42%
Last modified
CVE-2020-26116 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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.. EPSS estimates a 6.42% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Python | Python | >= 3.0.0, < 3.5.10 |
| Python | Python | >= 3.6.0, < 3.6.12 |
| Python | Python | >= 3.7.0, < 3.7.9 |
| Python | Python | >= 3.8.0, < 3.8.5 |
| Fedoraproject | Fedora | 31 |
| Fedoraproject | Fedora | 32 |
| Fedoraproject | Fedora | 33 |
| Canonical | Ubuntu Linux | 12.04 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Netapp | Solidfire | All versions |
| Netapp | Hci Storage Node | All versions |
| Debian | Debian Linux | 9.0 |
| Oracle | Zfs Storage Appliance Kit | 8.8 |
| Opensuse | Leap | 15.1 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00027.htmlMailing List, Third Party Advisory
- https://bugs.python.org/issue39603Exploit, Issue Tracking, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/11/msg00032.htmlMailing List, Third Party Advisory
- https://python-security.readthedocs.io/vuln/http-header-injection-method.htmlPatch, Third Party Advisory
- https://security.gentoo.org/glsa/202101-18Third Party Advisory
- https://security.netapp.com/advisory/ntap-20201023-0001/Third Party Advisory
- https://usn.ubuntu.com/4581-1/Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00027.htmlMailing List, Third Party Advisory
- https://bugs.python.org/issue39603Exploit, Issue Tracking, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/11/msg00032.htmlMailing List, Third Party Advisory
- https://python-security.readthedocs.io/vuln/http-header-injection-method.htmlPatch, Third Party Advisory
- https://security.gentoo.org/glsa/202101-18Third Party Advisory
- https://security.netapp.com/advisory/ntap-20201023-0001/Third Party Advisory
- https://usn.ubuntu.com/4581-1/Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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.
How severe is CVE-2020-26116?
CVE-2020-26116 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 6.42% probability of exploitation in the next 30 days.
How do I fix CVE-2020-26116?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-26116?
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