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Text of the page (random words):
ffort went into hardening against floods and abusive traffic http 2 gains limits on frames and rst_stream processed at once plus dynamic concurrent stream limits that throttle smoothly under attack and streams elasticity bounds the total stream count on the ssl side acme matured considerably with dns 01 and the new dns persist 01 challenge wildcards without handing over full dns zone access external account binding and issuance profiles while openssl 4 0 is now supported quic http3 sees the experimental qmux http 3 over tcp and congestion control selection on servers operations get easier with reusable health check sections a conf d directory in the systemd unit the long awaited opentelemetry filter replacing the now deprecated opentracing and improved live troubleshooting this cycle was also heavily focused on stabilization which should make this one of the cleanest 0 releases in a while as usual this short summary misses a lot so it s better to read the details on the haproxytech s blog and the mailing list announcement feb 12th 2026 cve 2026 26080 and cve 2026 26081 two vulnerabilities affecting some deep parts of the quic parsing were reported against versions 3 0 and above cve 2026 26081 and 3 2 and above cve 2026 26080 these were fixed and new versions were emitted 3 0 12 3 1 14 3 2 12 3 3 3 the risk is that specially crafted packets could crash the process more details on haproxy tech s blog we d like to particularly thank the reporter asim viladi oglu manizada for his responsible disclosure coming with a detailed analysis and a working reproducer dec 3rd 2025 haproxy technologies performance packages it s no news that many users have been hit by the massive performance cost caused by the switch to openssl 3 x a few years ago even if things are less dramatic with 3 1 3 6 than they were with 3 0 and we re actively working with the openssl team to help improve the situation the cost of leaving openssl 1 1 1 is still important for large scale users we ve also been working with alternatives such as wolfssl and aws lc that provide excellent performance even beyond openssl 1 1 1 but neither is packaged in mainstream distros for this reason haproxy technologies decided to provide a set of performance packages for latest debian ubuntu and soon rhel containing the latest haproxy stable version built against the latest aws lc stable version which currently happens to be the most feature complete and versatile alternative to openssl we hope this will save power users from having to decide between maintaining their own packages and dependencies or doubling the number of servers older news description haproxy is a free very fast and reliable reverse proxy offering high availability load balancing and proxying for tcp and http based applications it is particularly suited for very high traffic web sites and powers a significant portion of the world s most visited ones over the years it has become the de facto standard opensource load balancer is now shipped with most mainstream linux distributions and is often deployed by default in cloud platforms since it does not advertise itself we only know it s used when the admins report it the haproxy core team maintains multiple versions in parallel since version 1 8 two major version are emitted every year the first digit usually indicates a breaking change config format etc but in practice rarely changes the second digit indicates new features both constitute a branch one extra number appears after these digits to indicate the bug fix release the core team deploys a lot of efforts backporting fixes to older releases while being extremely careful not to break anything for this reason it is really important to stay up to date within one branch i e having the highest possible number on the last digits branches with an even number are called lts for long term support and are maintained for 5 years after their release during this time they will receive fixes for bugs that are discovered after the release these branches are aimed at general users who seek extreme stability and do not want to qualify a new version too often but still want to receive fixes branches with an odd number are only called stable they re aimed at highly skilled users who prefer to upgrade often to benefit from modern features and who are also able to roll back in case of problem these versions are maintained between 12 and 18 months the duration is short and purposely not strict so that the maintenance cycle is decided with users based on feedback and so that these versions do not end up in embedded products it may happen that a few features are backported to these version if there is some reasonable demand and the operation is considered riskless enough everyone used to dealing with production knows that it s difficult to upgrade components in field when one has to plan and advertise upwards of any operation for this reason the haproxy core team doesn t insist on users to upgrade will not ask someone to switch to a new branch unless they ask for a feature that is part of that other branch but will often ask the user to re check with the latest version of their branch before reporting a problem because nobody likes to troubleshoot a problem a second time it s often suggested to use the versions that come with the operating system when it follows the official maintenance cycle and depending on the expected level of stability or exposure some users may want to update as soon as an update is available while others may prefer to wait a few weeks to a month to be sure the update is reliable enough for them here s a very rough history of changes in each major version version 3 4 dynamic backends qmux acme with dns persist 01 opentelemetry version 3 3 quic on the backend persistent stats more seamless acme kernel tls splicing tls ech improved performance and observability version 3 2 acme ssl management improved cpu scalability quic performance improved troubleshooting version 3 1 troubleshooting improved config reliability improved quic and h2 performance new spoe engine finer error reporting version 3 0 crt stores persistent stats syslog load balancing json cbor log encoding virtual maps acls zero copy from the cache h2 h3 protocol level protections version 2 9 reverse http log backends zero copy forwarding memory usage reduction increased bandwidth better general scalability aws lc support quic openssl compat layer proxy protocol manipulation version 2 8 quic now prod ready lua based mailers ocsp auto updates letsencrypt wolfssl support rfc7239 forwarded listeners on more than 64 threads perf usability reliability observability improvements version 2 7 traffic shaping quic improvements thread groups easier switch to alternate ssl libraries improved debugging version 2 6 quic http3 openssl 3 0 better usability improved code accessibility and maintenance version 2 5 runtime server addition removal runtime ca crl updates native http client simplified https logging default tcp http rulesets jwt validation and more version 2 4 syslog and dns over tcp multi threaded lua full sharing of idle conns lower latency server side dynamic ssl update opentracing websocket over h2 atomic maps vary support new debugging tools even more user friendly cli and configuration lots of cleanups version 2 3 syslog forwarding better idle conn management improved balancing with large queues simplified ssl managment more stats metrics stricter config checking by default general performance improvements version 2 2 runtime certificate additions improved idle connection management logging over tcp http return directive errorfile templates tlsv1 2 by default extensible health checks version 2 1 improved i os and multi threading fastcgi runtime certificate updates htx only improved debugging removal of obsolete keywords version 2 0 grpc layer 7 retries process manager ssl peers log load balancing sampling end to end tcp fast open automatic settings maxconn threads http reuse pools version 1 9 improved multi threading end to end http 2 connection pools queue priority control stdout logging version 1 8 multi threading http 2 cache on the fly server addition removal seamless reloads dns srv hardware ssl engines version 1 7 added server hot reconfiguration content processing agents multi type certs version 1 6 added dns resolution support http connection multiplexing full stick table replication stateless compression version 1 5 added ssl ipv6 server side keep alive ddos protection version 1 4 client side keep alive stick to any expression more complete cli version 1 3 acl content switching frontend backend split cli tcp splicing dynamic lb algos version 1 2 epoll queuing more lb algorithms version 1 1 health checks cookie insertion version 1 0 high availability cookie based stickiness hide show older ones performance as shown in this test run on aws arm based graviton2 haproxy scales very well with threads and was shown to be able to reach 2 million requests s over ssl and 100 gbps for forwarded traffic this is made possible thanks to its event driven architecture that allows to react extremely quickly to i o events its parallelism on smp machines provided by light multi threading a task scheduler that permanently composes between low latency and high throughput and generally speaking a permanent quest of resource savings at every single architecture layer these efforts tend to cost a bit in development time but are immediately valued by users who are able to reduce their number of machines upgrade after upgrade for the vast majority of common loads the haproxy process is simply not noticed which tends to make its users forget it sometimes resulting in questions regarding extremely old versions please consult this section for more information on the architecture details and some performance test results reliability keeping high traffic sites online since 2002 haproxy is first known for being extremely robust the core team developers tend to be irritated by certain bugs they fix but this is because their job is to see them all most users report having never ever faced any single crash and claim that haproxy is the most solid part of their infrastructure finding machines with haproxy processes being up for more than 3 years is not exceptional at all all this is not an accident though a lot of efforts are made in that direction to provide excellent observability on what is happening and an amazing number of protections against bad behaviors haproxy is built with many checks for unacceptable situations impossible conditions endless loops etc that in other products might result in service outages or data corruption but in haproxy will immediately result in a crash with a dump of the problem this rigor pays off since most users have never faced such an issue thanks to the few who faced them and provided useful reports allowing to fix the problem early the development process also encourages quality with a long term maintenance cycle versions are maintained for 5 years by the same developers who code the new features this encourages them to write high quality code and commit messages that correspond to the highest standards a regression testing suite is used and run along development by all developers and before merging code as well as after on a wide variety of platforms thanks to the continuous integration ci system the principle of eating one s dog s food applies here as well haproxy org runs on the latest development release this usually helps spot a bug or two per major version before it hits a release but in addition it maintains a permanent pressure on the development team to release something they re confident in the program having been designed from its early age to be extremely conservative on resource usage a significant number of settings are calculated at startup time and enforce many limits on number of sockets connections streams etc guaranteeing that any processing that was started will complete security hardened by default security is a very important concern when deploying a software load balancer because it runs at the edge and takes all the dirty traffic it is possible to harden the os to limit the number of open ports and accessible services but the load balancer itself stays exposed the unified and non fantasist coding style aims at avoiding common traps when writing or reviewing code some high standards are sought when it comes to dealing with unvalidated data non portable functions and those having unreliable behaviors are avoided or replaced input data gets sanitized very early in the lower layers resource usage is carefully controlled dangling pointers are forbidden in the code via careful release functions these standards already help eliminate a great deal of uncertainty in the code itself since zero bug is not reasonable the product embarks a number of defensive measures such as chroot privilege drops fork prevention strict protocol validation checks for impossible states and detailed traces in case of violation detection etc all these usually result in an attempt to exploit a real bug in a failure or possibly a crash these measures have to be purposely disabled by the user using sufficiently evocative commands so that the reason for doing so has to be regularly questioned complete download matrix here you will find a quick access to downloadable contents by type and version just click on the desired format to access the content in that format dev 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 0 git repository git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web git web latest snapshot tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz tar gz latest release tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log tar gz log browsable dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir dir known bugs web web web web web web web web web web web web web web web web web web web web web web web web web web starter guide html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt configuration manual html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html txt html 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