Eight eMudhra CA Keys Compromised, Triggering Emergency Fixes Across Browsers and Software
The private keys of eight eMudhra intermediate certificate authority (CA) certificates are compromised, Mozilla and Google's Chrome Root Program confirms on October 20. An intermediate CA signs the certificates that websites present, so anyone holding one of these keys could issue a certificate for any website that a browser would accept. A researcher reported the compromise to the root programs on the evening of October 17, and Chrome and Firefox blocked the eight certificates within hours, after Chrome verified the findings. No TLS certificate chaining to the six intermediates used for websites had been logged to Certificate Transparency (CT) before Chrome's block, so none could have been trusted by default in Chrome or any other browser that requires CT logging, the Chrome Root Program said. It is not known how the keys left eMudhra, when, or whether anyone besides the researcher holds them. The keys are the ones Go blocked in its Octobe...
Oct 20, 2026