CVE-2020-26137
MEDIUMCVSS 6.5/10EPSS 2.23%
Last modified
CVE-2020-26137 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 2.23% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Python | Urllib3 | < 1.25.9 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 20.04 |
| Debian | Debian Linux | 9.0 |
| Oracle | Communications Cloud Native Core Network Function Cloud Native Environment | 22.2.0 |
| Oracle | Zfs Storage Appliance Kit | 8.8 |
References
- https://bugs.python.org/issue39603Issue Tracking, Vendor Advisory
- https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436bPatch, Third Party Advisory
- https://github.com/urllib3/urllib3/pull/1800Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00015.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/4570-1/Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- https://bugs.python.org/issue39603Issue Tracking, Vendor Advisory
- https://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436bPatch, Third Party Advisory
- https://github.com/urllib3/urllib3/pull/1800Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00015.htmlMailing List, Third Party Advisory
- https://usn.ubuntu.com/4570-1/Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, 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-2020-26137?
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 putrequest(). NOTE: this is similar to CVE-2020-26116.
How severe is CVE-2020-26137?
CVE-2020-26137 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.23% probability of exploitation in the next 30 days.
How do I fix CVE-2020-26137?
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-2020-26137?
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