CVE-2020-11076

HIGH

Puma 3.0.0-3.12.5 and 4.0.0-4.3.3 - HTTP Request Smuggling via Invalid Transfer-Encoding Header

Title source: llm

Exploitation Summary

EIP tracks 1 public exploit for CVE-2020-11076. PoCs published by dentarg.

AI-analyzed exploit summary This repository contains the source code and documentation for Puma, a Ruby web server, but does not include an exploit PoC for CVE-2020-11076. The README provides installation and configuration details for Puma.

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

This repository contains the source code and documentation for Puma, a Ruby web server, but does not include an exploit PoC for CVE-2020-11076. The README provides installation and configuration details for Puma.

Classification

Writeup 90%

Attack Type

Other

Complexity

Trivial

Reliability

Theoretical

Target: Puma (Ruby web server)

No auth needed

devstral-2 · analyzed Feb 16, 2026 Full analysis →