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Ballot FORUM-11: Creation of S/MIME Certificates Working Group

Vote Results

The voting period for Ballot FORUM-11 has ended and the Ballot has Failed. Here are the results:

Voting by Certificate Issuers – 4 votes total including abstentions

Three CAs voted in favor: DigiCert, Actalis, OISTE

One CA Abstained: Trustcor

Voting by Certificate Consumers – 4 votes total including abstentions

Three Browsers voted against: Apple, Google, Microsoft

One Browser abstained: Mozilla

Therefore, the ballot fails.

Ballot Text

The following ballot is proposed by Tim Hollebeek of DigiCert and endorsed by Wayne Thayer of Mozilla and Adriano Santoni of Actalis.

Ballot Forum-11: Creation of S/MIME Certificates Working Group

Purpose of the Ballot

The CA/Browser Forum recently underwent a two-year long governance reform exercise, modifying the Bylaws to allow the creation of working groups that covered topics other than server certificates. While originally motivated by the inability to maintain requirements for code signing certificates, it was anticipated from the start that this would also provide an opportunity to create other working groups that could develop and maintain certificate profiles and requirements for other kinds of certificates. While a number of regional and technical standards exist regarding the creation and issuance of S/MIME certificates, there is no current global forum for certificate authorities and those who consume or use S/MIME certificates to come together and develop and maintain policies and standards for those certificates. This lack of standards has impeded the adoption and interoperability of S/MIME certificate worldwide. This ballot would establish a working group chartered to develop and maintain such standards for S/MIME certificates, including but not limited to two important priorities: a uniform certificate profile for the issuance of publicly-trusted S/MIME certificates, and validation requirements for such certificates.

- MOTION BEGINS –

Establish S/MIME Certificates Working Group

Upon approval of the CAB Forum by ballot in accordance with section 5.3 of the Bylaws, the S/MIME Certificates Working Group (“SMWG”) is created to perform the activities as specified in the attached Charter.

- MOTION ENDS

Attached charter available here

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).