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On October 19, 2026, Cloudflare learned that the private keys of eight eMudhra intermediate certificates had been compromised. The certificates were widely trusted by browsers, operating systems and Cloudflare itself. Because the keys are weak, an attacker could forge a certificate for any domain and impersonate servers to intercept or mo…
Certificate authority eMudhra revoked eight intermediate certificates after a researcher known as Wayne found on October 17 that their P-384 private keys were so weak that anyone could recover them almost instantly. The keys, generated in April 2025, had values below 256, so an attacker could recover them by testing 256 candidates. This w…
Google, Mozilla, Apple, the Go project and other organizations moved quickly to block certificates issued by the Indian certificate authority eMudhra. The certificates are tied to 8 compromised keys. It is unclear how the keys were compromised. The source text available is limited to the headline and a short summary, so the scope of the a…
Mozilla received a report on 17 October 2026 that private keys for eight eMudhra intermediate certificates were compromised. The Indian certification authority says it has issued over 60 million certificates. Researchers found some of the keys were trivially small integers, so anyone could forge HTTPS certificates for arbitrary domains an…
Mozilla and the Chrome Root Program confirmed on October 20 that the private keys of eight eMudhra intermediate CA certificates (emSign brand) are compromised. Anyone holding these keys could issue certificates for any website that a browser would accept. A researcher credited as "Wayne" reported the compromise on October 17, and Chrome a…
On October 20, the Go team released Go 1.27.3 and Go 1.26.10 on its URGENT track. The certificate verifier now rejects any chain passing through one of eight intermediate CA keys, citing unspecified "specific security concerns around their operation." A commenter on the Go issue matched the SHA-256 key hashes to intermediates of the India…
