HAProxy

Category - Reverse Proxy, Load Balancer

HAProxy is free and open source software that provides a high availability load balancer and proxy server for web applications that spreads requests across multiple servers.


We have discovered  9,483 live websites   are using HAProxy.

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Technology usage statistics

Websites using HAProxy:9,483 websites
Most popular in: United States
Market position in Reverse Proxy category:#9
Market share in Reverse Proxy:less than 0.1%
Most popular version:2.7.5

Security vulnerabilites

Top 10 most common security vulnerabilities associated with HAProxy
PublishedCVETitleDomains
Jun, 2026CVE-2026-55204HAProxy - NULL Pointer Dereference in hpack_dht_insert Function4
Jun, 2026CVE-2026-55203HAProxy - Integer Overflow in FCGI Demux Record Length Field4
Nov, 2023CVE-2023-45539HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote attackers to o...4
May, 2018CVE-2018-10184An issue was discovered in HAProxy before 1.8.8. The incoming H2 frame length was checked against th...4
Apr, 2026CVE-2026-33555An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received ...3
Apr, 2025CVE-2025-32464HAProxy 2.2 through 3.1.6, in certain uncommon configurations, has a sample_conv_regsub heap-based b...3
Aug, 2023CVE-2023-40225HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23, 2.5.x and 2....3
Nov, 2019CVE-2019-19330The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage r...1
Jul, 2019CVE-2019-14241HAProxy through 2.0.2 allows attackers to cause a denial of service (ha_panic) via vectors related t...1
May, 2019CVE-2019-11323HAProxy before 1.9.7 mishandles a reload with rotated keys, which triggers use of uninitialized, and...1

Technology adoption

Recent changes in HAProxy usage.
Websites that added HAProxy 246
Websites that dropped HAProxy 248

Available Reports


Technology Information


Major Versions

  • 2.xx (1 subversions, 3 domains)

Website Distribution by Country

Number of websites using HAProxy
United States5,117 websites


Germany2,422 websites
France526 websites
Switzerland244 websites
Netherlands136 websites
Indonesia132 websites
Canada119 websites
Russia101 websites
GB92 websites
Austria88 websites

Website Distribution by TLD

Number of websites using HAProxy
.org3,756 websites
.com1,743 websites
.de1,651 websites
.ch534 websites
.fr282 websites
.at157 websites
.net109 websites
.eu92 websites
.ru88 websites
.co.uk85 websites

HAProxy Versions

sorted by popularity
2.7.53 websites

See all HAProxy versions ...

Top Websites Using HAProxy

A look at the most popular websites built with HAProxy
DomainCountryRankContacts
en.wikipedia.org United States53
de.wikipedia.org United States311
fr.wikipedia.org United States619
upload.wikimedia.org United States625
es.wikipedia.org United States748
commons.wikimedia.org United States857
See full domain list

Always Used together



Alternative Technologies


Nginx: Total 13,787,430 domains found using Nginx
Envoy Proxy: Total 163,006 domains found using Envoy Proxy
F5 BigIP: Total 148,636 domains found using F5 BigIP
ATS: Total 42,751 domains found using ATS
Istio: Total 32,182 domains found using Istio
EZproxy: Total 22,058 domains found using EZproxy
ALProxy: Total 10,226 domains found using ALProxy
Squid: Total 9,593 domains found using Squid
Kangle: Total 2,228 domains found using Kangle
eBay Proxy Server: Total 1,237 domains found using eBay Proxy Server

FAQ

HAProxy falls under the categories of Reverse Proxy, and Load Balancer.
WebTechSurvey systematically indexes websites and their technologies. Users can find websites using HAProxy through the WebTechSurvey platform.
There are currently 57,408,501 live websites that use HAProxy.
The main competitors to HAProxy include Nginx, Envoy Proxy, F5 BigIP, and ATS.
HAProxy has a known security vulnerabilities: CVE-2026-55204, CVE-2026-55203, CVE-2026-33555, and CVE-2025-32464.