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Emergency Release of Tails 7.15.1 to Mitigate Compromised eMudhra Certificates

Emergency Release of Tails 7.15.1 to Mitigate Compromised eMudhra Certificates

First seen 23 Oct 2026, 18:46 UTC • •
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ThreatCluster AI
ThreatCluster •October 23, 2026 at 20:43 UTC
  • •Emergency release of Tails 7.15.1 to address compromised eMudhra certificates.
  • •Tor Browser 15.0.26 blocks all eMudhra certificates to prevent impersonation attacks.
  • •No active exploitation of the vulnerability has been reported yet.

On October 17, 2026, Mozilla blocked the certificates of eMudhra due to a compromise of its intermediate certificates. This vulnerability, identified as CVE-2026-113470, allows attackers to impersonate any website using these certificates, potentially affecting users via Tor exit nodes. Tor Browser 15.0.26, released on the same day, blocks all eMudhra certificates to prevent exploitation. The Tails operating system has released version 7.15.1 as an emergency update to address this issue. Users are advised to upgrade their Tails USB sticks to maintain security. Onion sites remain unaffected by this vulnerability. There have been no confirmed reports of this attack being through exit nodes so far.

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Timeline

2026-10-17
Mozilla blocks eMudhra certificates
Mozilla blocked the certificates of eMudhra after its intermediate certificates were compromised, allowing potential website impersonation.
Blog.Torproject
2026-10-20
CVE-2026-113470 published
CVE-2026-113470 was published, detailing the vulnerability related to the compromised eMudhra certificates.
Blog.Torproject
2026-10-23
Release of Tails 7.15.1
Tails 7.15.1 was released as an emergency update to mitigate the risks posed by the compromised eMudhra certificates.
Blog.Torproject

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Common questions

What is CVE-2026-113470?
CVE-2026-113470 is a vulnerability related to compromised eMudhra certificates that could allow attackers to impersonate websites.
How do I upgrade Tails?
Users can upgrade their Tails USB stick automatically from version 7.0 or later to 7.15.1, or manually if needed.
Are onion sites affected by this vulnerability?
No, onion sites are not vulnerable to this attack as they do not rely on the compromised certificates.