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Announcing the formation of the Code Signing Working Group – Call for Participants

The CA/Browser Forum has chartered a Code Signing Working Group, the purpose of which is to come up with Baseline Requirements to reduce the incidences of signed malware. The CA/Browser Forum would like to invite interested third parties to participate. The working group meets bi-weekly by phone and had its first face to face meeting in Munich on June 13th coinciding with the regular CA/Browser Forum meeting.

Interested parties will need to:

  1. Review the Intellectual Property Rights policy (/IPR_Policy_V1.pdf) and complete the IPR agreement which can be found here: /IPR_Agreement_V1.pdf
  2. Send an email to questions@cabforum.org with your name, organization (if applicable), contact details and the signed agreement with the subject: Code Signing Working Group Participation

Once the Chair determines all is in order, you will be added to the mailing list and invited to the conference calls.

As the title of this group states, this is a Working Group, meaning everyone is expected to contribute in some fashion. Please do not apply if you can’t devote time to attend and participate in the discussion.

Latest releases
Server Certificate Requirements
SC098: Process RFC 8657 CAA Parameters - Jun 16, 2026

Code Signing Requirements
v3.8 - Aug 5, 2024

What’s Changed CSC-25: Import EV Guidelines to CS Baseline Requirements by @dzacharo in https://github.com/cabforum/code-signing/pull/38 Full Changelog: https://github.com/cabforum/code-signing/compare/v3.7...v3.8

S/MIME Requirements
v1.0.15 - Ballot SMC017v2 - Jul 30, 2026

This ballot increases the minimum RSA key size for Root and Subordinate CA certificates in the S/MIME BRs from 2048 to 4096 bits for keys created after September 15, 2026, while retaining the 2048-bit minimum for Subscriber certificates. The ballot further requires that by September 15, 2027, CAs SHALL NOT issue Subscriber certificates from any Sub-CA whose RSA key modulus is less than 3072 bits, effectively sunsetting issuance from legacy 2048-bit Sub-CAs. The ballot also includes minor typographic corrections. This ballot is proposed by Martijn Katerbarg (Sectigo) and endorsed by Ben Wilson (Mozilla) and Stephen Davidson (DigiCert)

Network and Certificate System Security Requirements
Version 2.0.5 (Ballot NS-008) - Jul 9, 2025

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The Certification Authority Browser Forum (CA/Browser Forum) is a voluntary gathering of Certificate Issuers and suppliers of Internet browser software and other applications that use certificates (Certificate Consumers).