Using emSign Certificates? What the eMudhra Key Issue Means for You

eMudhra CA key compromise October 2026

On 17 October 2026 a researcher showed that the private keys of eight eMudhra intermediate certificates could be recovered. Mozilla's early finding is that the keys were extremely small numbers rather than random values. eMudhra revoked the certificates on 18 October, and the major browsers and Microsoft have blocked them. eMudhra blamed human error and a flaw in a key generation script from an April 2025 key ceremony; the cause is still being investigated.

Why it still matters after the browser block

  • An intermediate key is what makes a website certificate trusted, so a holder of these keys could create a fake certificate for a site they do not own.
  • Servers, scripts, payment and API integrations, older Android apps and embedded devices often do not check revocation lists.
  • Because Mozilla removed the emSign ECC Root CA G3, some genuine sites and APIs on G3 chains may stop working for some users.

What IT teams should check

  • Keep browsers and operating systems updated.
  • List every certificate under an emSign G3 chain and replace the affected ones.
  • Update non-browser trust stores, then test payment gateways, government portals and partner APIs.
  • If you use eMudhra for DSC or eSign, ask your provider in writing whether you are affected.

Read the full article here: eMudhra CA Key Compromise: What Indian IT Teams Must Do

Published by Affix Center, a Mumbai-based IT services company. See our cybersecurity services.

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