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...
Web Injection Threats: The Cost of Community Engagement on Your Site
Customer engagement drives web application design, but user-generated content brings inherent security challenges. - Read more
Defending Our Brand [Updated]
Update, June 24 2016
We have confirmed that Comodo submitted Requests for Express Abandonment for all three trademark registration applications in question. We’re happy to...
Progress Towards 100% HTTPS, June 2016
Our goal with Let’s Encrypt is to get the Web to 100% HTTPS. We’d like to give a quick progress update.
Let’s Encrypt has issued...
Leaving Beta, New Sponsors
Let’s Encrypt is leaving beta today. We’re also excited to announce that founding sponsors Cisco and Akamai have renewed their Platinum sponsorships with 3-year...
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...
