Ubuntu NSS: update removes emSign ECC Root CA G3 and Comodo AAA root certificates
Summary
Canonical updated the CA certificates in the nss package (USN-8947-1, published 2026-10-21). The update removes the root certificates "emSign ECC Root CA - G3" and "Comodo AAA Services root" because intermediate CA certificates were compromised. A standard system update applies the change.
What changes?
After the update, certificates that chain to the removed roots are no longer trusted by software using the NSS trust store. This can cause certificate errors for services whose certificates depend on these roots. The notice does not list specific error messages.
Affected
- Ubuntu systems with the nss package (see USN-8947-1 for the affected releases and fixed package versions)
- Software using the NSS trust store
Preparation and temporary exceptions
No workaround known.
Check and complete
Install the standard system update for the nss package as described in USN-8947-1. The update itself makes the necessary changes.
Recommendation
Install the NSS update via the normal patch process. Afterwards, check internal and external services and applications that use certificates chaining to emSign ECC Root CA - G3 or Comodo AAA Services root, and ask the certificate issuer for a replacement chain if needed.
Timeline
- Canonical publishes USN-8947-1: the NSS update removes the two CA certificates.
Sources
- USN-8947-1: NSS update Vendor · ubuntu.com
Compiled from the sources listed and translated with AI (Claude); status and dates come from the vendor. The vendor’s statements are authoritative. Updated 1 Nov 2026, 15:37.
Where the information comes from
We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:
- Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
- other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
- community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
- targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
- early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online
Summary and translation with AI (Claude by Anthropic) – without any data of visitors.
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