HTTP Smuggling via Transfer-Encoding Header in Puma
CVE-2020-11076

7.5HIGH

Key Information:

Vendor: Puma
Status: Puma
Vendor: CVE Published:; 22 May 2020

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👾 Exploit Exists🟡 Public PoC

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.

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Affected Version(s)

puma < 3.12.5 < 3.12.5

puma >= 4.0.0, < 4.3.4 < 4.0.0, 4.3.4

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

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Created by dentarg