2025-11-13
We explore the fundamentals of Saltstack and how we use it at Cloudflare. We also explain how we built the infrastructure to reduce release delays due to Salt failures on the edge by over 5%. ...
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2025-11-12
Remote bindings allow you to connect your local Worker code to deployed Cloudflare resources like R2 and D1. Come along on the technical journey of how we built this feature to create a seamless local development experience....
2025-11-10
Cloudflare Workflows, our durable execution engine for running multi-step applications, now supports Python. That means less friction, more possibilities, and another reason to build on Cloudflare....
2025-11-07
Announcing a new self-serve API for Bring Your Own IP (BYOIP), giving customers unprecedented control and flexibility to onboard, manage, and use their own IP prefixes with Cloudflare's services....
2025-11-06
We’re excited to announce the open sourcing of tokio-quiche, our async QUIC library built on quiche and tokio. Relied upon in our services such as iCloud Private Relay and our next-generation Oxy-based proxies, tokio-quiche handles millions of HTTP/3 requests per second with low latency and high throughput. ...
2025-11-06
Cloudflare Stream provides a unified platform for video storage, encoding, and delivery. We are now enabling developers to seamlessly extract audio from videos....
2025-11-05
Workers VPC Services enter open beta today. We look under the hood to see how Workers VPC connects your globally-deployed Workers to your regional private networks by using Cloudflare's global network, while abstracting cross-cloud networking complexity....
2025-11-04
End-to-end testing for Cloudflare Workflows was challenging. We're introducing first-class support for Workflows in cloudflare:test, enabling full introspection, mocking, and isolated, reliable tests for your most complex applications....
2025-11-03
Cloudflare used historical data to investigate reports of potential new firewall tests in Turkmenistan. Shifts in TCP resets/timeouts across ASNs corroborate large-scale network control system changes. ...
2025-10-31
A BGP “zombie” is essentially a route that has become stuck in the Default-Free Zone (DFZ) of the Internet, potentially due to a missed or lost prefix withdrawal. We’ll walk through some situations where BGP zombies are more likely to rise from the dead and wreak havoc. ...
2025-10-31
HTTP/2 implementations often respond to suspected attacks by closing the connection with an ENHANCE_YOUR_CALM error code. Learn how a common pattern of using Go's HTTP/2 client can lead to unintended errors and the solution to avoiding them....
2025-10-30
We propose an open registry format for Web Bot Auth to move beyond IP-based identity. This allows any origin to discover and verify cryptographic keys for bots, fostering a decentralized and more trustworthy ecosystem....
2025-10-30
As AI agents change how the Internet is used, they create a challenge for security. We explore how Anonymous Credentials can rate limit agent traffic and block abuse without tracking users or compromising their privacy....
2025-10-30
The world is adopting anonymous credentials for digital privacy, but these systems are vulnerable to quantum computers. This post explores the cryptographic challenges and promising research paths toward building new, quantum-resistant credentials from the ground up....
2025-10-29
Researchers and practitioners have been studying connections almost as long as the Internet that supports them. Today, Cloudflare’s global network receives millions of connections per second. We explore various characteristics of TCP connections, including lifetimes, sizes, and more....
2025-10-29
IPv4 scarcity drives widespread use of Carrier-Grade Network Address Translation, a practice in ISPs and mobile networks that places many users behind each IP address, along with their collected activity and volumes of traffic. We introduce the method we’ve developed to detect large-scale IP sharing globally and mitigate the issues that result. ...
2025-10-29
WARP’s initial implementation resembled a VPN that allows Internet access through it. Here’s how we built it – and how you can, too. ...
2025-10-29
We identified and patched two DDoS vulnerabilities in our QUIC implementation related to packet acknowledgements. Cloudflare customers were not affected. We examine the "Optimistic ACK" attack vector and our solution, which dynamically skips packet numbers to validate client behavior. ...
2025-10-29
Many products at Cloudflare aren’t possible without pushing the limits of network hardware and software to deliver improved performance, increased efficiency, or novel capabilities such as soft-unicast, our method for sharing IP subnets across data centers. Happily, most people do not need to know the intricacies of how your operating system handles network and Internet access in general. Yes, even most people within Cloudflare. But sometimes we try to push well beyond the design intentions of Linux’s networking stack. This is a story about one of those attempts....
2025-10-29
Cloudflare mitigated a 12-hour DDoS attack against Moldova's Central Election Commission, blocking over 898 million malicious requests that peaked at 324,333 requests per second. This defense kept critical election infrastructure online and accessible for citizens during a critical parliamentary vote....
