Operations | Monitoring | ITSM | DevOps | Cloud

Connecting nearly a billion professionals is no small feat. It requires an infrastructure that puts the user experience above everything else. At LinkedIn, this principle created a massive engineering challenge: delivering a fast, consistent experience across various use cases, from the social feed to real-time messaging and enterprise tools.

The timing couldn’t have been better. Last week, the tech world descended on Las Vegas for AWS re:Invent. It was the perfect venue to talk about cloud infrastructure, scale, and the future of application delivery. While we enjoyed talking shop at our booth, we didn't just bring swag and demos; we brought a significant performance improvement for our open-source community.

HTTP/1.1 is a text-based protocol where the message framing is mixed with its semantics, making it easy to parse incorrectly. The boundaries between messages are very weak because there is no clear delimiter between them. Thus, HTTP/1.1 parsers are especially vulnerable to request smuggling attacks.

The state of web app, API, and AI service security is in constant flux, with threats seemingly lurking around every corner. For years, organizations have relied on web application firewalls (WAFs) as a critical layer of defense. HAProxy Technologies has long provided robust WAF solutions, including earlier versions such as the "Advanced WAF" and "ModSecurity WAF" — based on the popular open source WAF engine. These excelled against widely-known OWASP Top 10 threats.

On December 3, 2025, the React team announced a critical security vulnerability in React Server Components (RSC). Identified as CVE-2025-55182 (and covering the now-duplicate CVE-2025-66478), this flaw allows unauthenticated attackers to execute arbitrary JavaScript code on backend servers.

Unlock peak load balancing performance with HAProxy! In this blog post, we'll explore how HAProxy intelligently harnesses the power of modern multi-core CPUs while navigating challenging architectural complexities like NUMA. Discover how HAProxy leverages optimized multithreading and provides automatic CPU binding to deliver both unparalleled efficiency and speed, ensuring your load balancing is faster than ever.

At KubeCon, we asked a simple question at our booth: "How much is your service mesh costing you?" The answers were eye-opening. Engineers shared stories of 40% resource overhead, multi-second latency spikes during peak traffic, and infrastructure bills that had nearly doubled since mesh adoption. One architect told us they were spending more time managing their mesh than building features.

One of the most anticipated presentations at HAProxyConf 2025 came from gaming and user-generated content (UGC) innovators Roblox. Software Engineer Chris Jones and Senior Site Reliability Engineer Ben Meidel gave an enthusiastic and enjoyable presentation, detailing their journey from legacy hardware to a sophisticated, automated, and secure application delivery platform, with seamless, API-powered dynamic configuration and upgrades, supported by the HAProxy Enterprise Dynamic Update Module.

HAProxy 3.3 is here, and this release brings downloadable packages compiled by HAProxy Technologies, numerous TLS enhancements including expanded ACME support, better observability with persistent stats over reloads, and many improvements to performance and flexibility such as support for QUIC on the backend. These powerful capabilities help HAProxy remain the G2 category leader in API Management, Container Networking, DDoS Protection, Web Application Firewall (WAF), and Load Balancing.