Explore the latest developments concerning 8 eMudhra certificates.
8 eMudhra certificates are compromised. Here's what you need to know
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 create a forged certificate for any domain and use it to impersonate servers to intercept or modify traffic. This is a serious security incident with implications across the Internet. For reference, here is a link to more information about how SSL certificates work and why they are so critical to the operation of the Internet.
We immediately prioritized patching critical services across Cloudflare to protect our customers ahead of the public disclosure of the vulnerability. Our security review has not identified active exploitation of this issue on Cloudflare services.
Cloudflare warns fixing botched eMudhra certs goes beyond browsers
Cloudflare has warned that customers may need to act on their own servers after weak keys in eight eMudhra intermediate certificates left them open to forgery.
The company said that because the keys were weak, an attacker could create a forged certificate for any domain and use it to impersonate servers, intercepting or modifying traffic.
Unusually, nothing needed stealing to create the easy to exploit flaw in the digital credentials.
The private keys, generated in an April 2025 key ceremony, were integers below 256 rather than large random numbers, which let anyone recalculate them almost instantly.
eMudhra told Mozilla's bug tracker that a code flaw during an approved test created a second, weaker set of keys, which were then used by mistake.
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