# Sunset all remaining use of SHA-1 in Certificates and CRLs. — TLS certificate and CA requirement effective dates (CA/Browser Forum, Chrome, Mozilla)

For Sunset all remaining use of SHA-1 in Certificates and CRLs., requirement is Sunset all remaining use of SHA-1 in Certificates and CRLs; effective date is 2026-09-15; baseline requirements section is 7.1.3.2.1; authority is CA/Browser Forum TLS Baseline Requirements; scope is all publicly-trusted CAs issuing TLS server certificates, recorded from its source on 2026-08-05.

- **Requirement:** Sunset all remaining use of SHA-1 in Certificates and CRLs. _(verified: appears in the quote below)_
- **Effective date:** 2026-09-15 _(verified: appears in the quote below)_
- **Baseline Requirements section:** 7.1.3.2.1 _(verified: appears in the quote below)_
- **Authority:** CA/Browser Forum TLS Baseline Requirements _(our reading, not quoted from the source)_
- **Scope:** all publicly-trusted CAs issuing TLS server certificates _(our reading, not quoted from the source)_

## What the source says

> 2026-09-15 | 7.1.3.2.1 | Sunset all remaining use of SHA-1 in Certificates and CRLs.

## Source

- https://cabforum.org/working-groups/server/baseline-requirements/requirements/

Last verified: 2026-08-05. Review by: 2026-11-03.
Part of [TLS certificate and CA requirement effective dates (CA/Browser Forum, Chrome, Mozilla)](https://referencesource.org/tls-certificate-requirement-effective-dates/).