Let’s Encrypt 2016 In Review
Our first full year as a live CA was an exciting one. I’m incredibly proud of what our team and community accomplished during 2016....
Launching Our Crowdfunding Campaign
Today we kicked off our first crowdfunding campaign with the goal of raising enough funds to cover about one month of our operations -...
Our First Grant: The Ford Foundation
We are proud to announce that The Ford Foundation has awarded us a grant to help our growing operations.
The Ford Foundation is a major...
Squarespace OCSP Stapling Implementation
We’re excited that Squarespace has decided to protect the millions of sites they host with HTTPS! While talking with their
team we learned they were...
Introducing Internationalized Domain Name (IDN) Support
Let’s Encrypt is pleased to introduce support for issuing certificates that contain Internationalized Domain Names (IDNs). This means that our users around the world...
DDoS’s Newest Minions: IoT Devices (Volume 1)
The latest evolution of cyber weapons is brought to you by the default passwords in Internet of Things (IoT) devices. - Read more
ISRG Legal Transparency Report, January 2016 – June 2016
The trust of our users is ISRG’s most critical asset. Transparency regarding legal requests is an important part of making sure our users can...
What It Costs to Run Let’s Encrypt
Today we’d like to explain what it costs to run Let’s Encrypt. We’re doing this because we strive to be a transparent organization, we...
Let’s Encrypt Root to be Trusted by Mozilla
The Let’s Encrypt root key (ISRG Root X1) will be trusted by default in Firefox 50, which is scheduled to ship in Q4 2016....
Full Support for IPv6
Let’s Encrypt is happy to announce full support for IPv6.
As IPv4 address space is exhausted, more and more people are deploying services that are...
Latest article
Sysco – 2,691,852 breached accounts
In June 2026, the food distribution company Sysco was targeted by a ShinyHunters "pay or leak" extortion campaign. Data was subsequently published containing 2.7M...
CVE-2023-6606 Kernel: out-of-bounds read vulnerability in smbcalcsize
Information published. - Read more
Anthropic Confirms Claude Mythos 5 Redeployment for US Critical Infrastructure Organizations
Anthropic has confirmed that Claude Mythos 5, its most powerful AI cybersecurity model, will be redeployed to a select set of U.S. organizations responsible...
Chromium: CVE-2026-13027 Use after free in FileSystem
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see (https://chromereleases.googleblog.com/2025) for more information. - Read...
