CVE-2020-11076
HIGHCVSS 7.5/10EPSS 4.09%
Last modified
CVE-2020-11076 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.. EPSS estimates a 4.09% chance of exploitation in the next 30 days.
Description
In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Puma | Puma | >= 3.0.0, < 3.12.6 |
| Puma | Puma | >= 4.0.0, < 4.3.5 |
| Fedoraproject | Fedora | 33 |
| Debian | Debian Linux | 9.0 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.htmlMailing List, Third Party Advisory
- https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5hThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00009.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.htmlMailing List, Third Party Advisory
- https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5hThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00009.htmlMailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-11076?
In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.
How severe is CVE-2020-11076?
CVE-2020-11076 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.09% probability of exploitation in the next 30 days.
How do I fix CVE-2020-11076?
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-2020-11076?
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Scan your code nowSource: NVD / NIST