CVE-2020-11076

HIGH

Puma <4.3.4, <3.12.5 - SSRF

Title source: llm

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.

Exploits (1)

nomisec WRITEUP

by dentarg · poc

https://github.com/dentarg/cougar

View Code ZIP pw:eip

References (7)

[Mailing List, Third Party Advisory] http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html

[Mailing List, Third Party Advisory] http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html

[Release Notes] https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22

[Patch] https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd

[Third Party Advisory] https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/

Scores

CVSS v3 7.5

EPSS 0.0178

EPSS Percentile 82.8%

Attack Vector NETWORK

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

Details

CWE

CWE-444

Status published

Products (4)

debian/debian_linux 9.0

fedoraproject/fedora 33

puma/puma 3.0.0 - 3.12.6

rubygems/puma 0 - 3.12.5RubyGems

Published May 22, 2020

Tracked Since Feb 18, 2026