CVE-2023-25950

HIGH LAB

HAProxy 2.6.1-2.6.7 and 2.7.0 - HTTP Request Smuggling

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2023-25950. PoCs published by dhmosfunk.

AI-analyzed exploit summary This repository provides a detailed technical analysis of CVE-2023-25950, an HTTP/3 header smuggling vulnerability in HAProxy. It includes a patch diff, source code review, and lab setup instructions to demonstrate the vulnerability.

Description

HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate user's request. As a result, the attacker may obtain sensitive information or cause a denial-of-service (DoS) condition.

Exploits (1)

nomisec WRITEUP 10 stars
by dhmosfunk · poc
https://github.com/dhmosfunk/HTTP3ONSTEROIDS

This repository provides a detailed technical analysis of CVE-2023-25950, an HTTP/3 header smuggling vulnerability in HAProxy. It includes a patch diff, source code review, and lab setup instructions to demonstrate the vulnerability.

Classification
Writeup 95%
Attack Type
Other
Complexity
Moderate
Reliability
Reliable
Target: HAProxy 2.7.0
No auth needed
Prerequisites: HTTP/3 support in HAProxy · Backend server that processes malformed headers
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (3)

Core 3

Scores

CVSS v3 7.3
EPSS 0.0294
EPSS Percentile 85.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Lab Environment

COMMUNITY
Community Lab
docker pull httpd:latest

Details

CWE
CWE-444
Status published
Products (2)
haproxy/haproxy 2.7.0
haproxy/haproxy 2.6.1 - 2.6.7
Published Apr 11, 2023
Tracked Since Feb 18, 2026