Welcome to the 26th edition of Cloudflare's DDoS Threat Report. This edition covers the third quarter of 2026 — July, August, and September — and returns the series to its quarterly cadence following the combined H1 2026 volume. The analysis is produced by Cloudforce One , Cloudflare's Threat Intelligence…
Last week was one for the Internet security history books. First, eight eMudhra intermediate certificates were compromised , creating the possibility of forged certificates that could be used to impersonate servers. Then came php2shell : serious vulnerabilities in PHP, the runtime behind a large portion of the Web.…
On September 8, 2026, we were alerted by a security researcher, Gadi Evron from Knostic , to a tenant isolation issue affecting the GLM-5.3 Workers AI model ( @cf/zai-org/glm-5.3 ) starting on August 27, 2026. We have remediated the issue, and we restored the model on September 9. We have confirmed that no other model…
For ten days, auditors appointed by the Korea Internet & Security Agency (KISA) sat together with us and worked through 80 controls. That is what it took for a company headquartered in the United States, operating a global network serving Korean users, to be certified in South Korea. Cloudflare has now obtained South…
Today, we are expanding our web application firewall (WAF) by adding two new capabilities: full transaction detections and response rules. Full transaction detections evaluate each HTTP request alongside its response to identify evidence of exploitation. It helps answer both "Does this request look malicious?" and…
Update - On October 23, the PHP project published an informational advisory for a related vulnerability, CVE-2026-115560, in PHP's session upload progress feature. It affects fully patched PHP releases, including 8.5.12, and will be fixed in PHP's next regular release. All Cloudflare WAF customers are…
On October 19, 2026, at approximately 17:00 UTC, Cloudflare became aware that private keys associated with eight eMudhra intermediate certificates were compromised. These certificates were widely trusted by browsers, operating systems, and also within Cloudflare. Because the keys themselves are weak, an attacker can…
The recent disclosure of a major vulnerability in Citrix NetScaler pointed to a widespread weak point: a login page is an attack surface that can be used to compromise and access an application server. Indeed, the disclosures included an actively exploited flaw that allowed attackers to execute commands on affected…
A driver’s license tells you who someone is and that they passed a driving test, not whether they’ll drive responsibly in the future. The same is true for bots: verifying who operates it creates accountability, but trust depends on what it does next. A known bot can still ignore website preferences, overwhelm origins,…
Security alerts rarely arrive one at a time. A single alert can cause a spike across the environment, requiring a human analyst to decide which alerts are related and what they mean. When multiple arrive at the same time, it can quickly overwhelm even a seasoned security analyst. Enter the alert paradox. Now, our…
We launched Quick Tunnels in 2021 to give developers an easy way to share their latest service, application, or project running in their local development environment. A lot has changed since then, but the core use case remains the same. Your coding agent has just finished the feature. The dev server is up on…
Traditionally, preventing online fraud relied on point-in-time proof of identity: enter the correct password, complete a biometric verification, or pass a liveness check, and gain access. To defeat these controls, fraudsters had to steal credentials and other identity evidence from a real user, which was difficult to…
It's Birthday Week, when we traditionally ship presents to the Internet. This year, two of them come from Europe: EuroLLM, which covers all 24 official EU languages, and Apertus, Switzerland's fully open model, trained on more than 1,500 languages. Both were built by public universities and research…
Today, we are launching Application Profiles, a seamless way to enforce a positive security policy. By analyzing the structure and format of HTTP requests and identifying deviations, Cloudflare can help you significantly reduce the attack surface area. Every customer we speak to wants to know how we can protect them…
Today, we are introducing additional post-quantum (PQ) cryptography visibility tools into Cloudflare's Application Security and Logs products. You can now inspect and graph the adoption of post-quantum TLS 1.3 encryption for live traffic from directly within Logpush , Log Explorer , and the HTTP Traffic Analytics…
Organizations can now scale threat intelligence expertise the way they scale infrastructure. Threat intelligence analysts and network defenders have long automated the ingestion of structured threat feeds to help enrich their SIEM or WAF. The harder work has always been unstructured reporting: turning a research post…
When you type in an address into a browser, how do you know you’re connecting to the right website? The Web Public Key Infrastructure (Web PKI) is the complex and distributed ecosystem of policies, protocols, and infrastructure operators that helps you trust that you’re not being misdirected to an incorrect or…
Twelve years ago, during Birthday Week 2014, we turned on Universal SSL and nearly doubled the number of encrypted sites on the web overnight, giving free TLS to every site behind Cloudflare, including the ones that never paid us a cent. Encryption stopped being an expensive, time-intensive undertaking and instead…
As laboratories around the world race to build out a cryptographically relevant quantum computer , we at Cloudflare are racing towards a 2029 target deadline for full post-quantum readiness . While we’ve already transitioned many of our products to post-quantum encryption, we still have work to do to support…
In 2023, Cloudflare declared itself free from CAPTCHAs with the launch of Turnstile, our privacy-first client-side challenge. Turnstile is free to use, works on any site (no need to proxy traffic through Cloudflare), and never asks a visitor to solve a puzzle. Now, we are launching Turnstile Spin, an agent-mediated…