CVE-2020-11076

HighCVSS 7.5/10Last modified Jun 17, 2026

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 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-444

Affected software

Vendor	Product	Versions
puma	puma	< 3.12.5; >= 4.0.0, < 4.3.4

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/blob/master/History.md#434435-and-31253126--2020-05-22Release Notes
https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bdPatch
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
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/
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/blob/master/History.md#434435-and-31253126--2020-05-22Release Notes
https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bdPatch
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
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/

Timeline

Published: May 22, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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