The Shift to Shorter TLS/SSL Certificate Validity: What It Means and Why It Matters

Introduction

For many years, TLS/SSL certificates were issued with validity periods of one year or more, allowing organisations to renew certificates annually with relatively low effort. However, this model is changing. Major Certificate Authorities (CAs) are reducing certificate lifespans from 397 days to a new maximum validity of 199 days for public TLS certificates.

This change is not just an administrative update; it represents a fundamental shift in how trust, security, and automation are handled on the internet. While shorter validity periods increase operational effort, they significantly improve security and reliability in the long term.

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The Timeline of Change

• Before February 24, 2026 Reissued public TLS certificates could have a validity of up to 397 days.

• On or after February 24, 2026 (DigiCert)Reissued or duplicated certificates will be limited to a maximum of 199 days.

• From March 14, 2026 (Sectigo)The same 199 day maximum validity applies.

• From March 15, 2026 (GlobalSign)The same 200 day maximum validity applies.

• More than 24 CAs are following the similar patterns for TLS/SSL certifications.

This means that even if an organisation purchases a 1 year or 2 year certificate order, each issued certificate from that order can only be valid for about six months.

Understanding Certificate Expiry vs Order Expiry

With shorter lifetimes, it is critical to distinguish between two different dates:

• CertificateEndDateInUTC: This is the date when the installed certificate expires and stops working. If this date is missed, websites and APIs will fail.

• OrderExpiryDateInUTC: This is the date until which the certificate order remains valid. Until this date, certificates can be reissued at no extra cost.

Tracking both dates is essential to avoid outages and re validation delays.

Impact on API Certificate Orders

For API-based certificate requests, the change is handled gracefully:

• If an API request specifies a validity period greater than 199 days,the order will still be created for the requested duration.

• However, the issued certificate will be limited to 199 days.

This design prevents API failures while enforcing the new security standard.

Operational Impact on Organisations

1. Increased Management Overhead

Certificates must now be renewed approximately twice a year, instead of annually. This increases tracking, coordination, and deployment effort.

2. Mandatory Automation

Manual renewal processes significantly increase the risk of:

• Missed renewals

• Expired certificates

• Service outages

As a result, automation is no longer optional.

3. More Frequent Domain and Organisation Validation

Validated domains now have shorter validity, requiring more frequent checks during reissues or new issuance.

How Organisations Can Manage Shorter Validity

1. Manual Reissue

Organisations can still purchase 1 or 2 year certificates and manually reissue them every 6 months.This requires:

• Strict monitoring

• Enabled notifications

• Disciplined operational processes

This approach is risky at scale.

2. Automation (Recommended)

To reduce risk and effort, organisations are encouraged to adopt automation:

• ACME: Automatically requests, renews, and installs certificates

• Auto Install (cPanel / Plesk): Built in automation for hosting environments

• Certificate Lifecycle Management (CLM): Enterprise grade platforms that manage thousands of certificates, track expiry, enforce policies, and ensure compliance

Automation ensures reliability, security, and audit readiness.

Why Shorter Certificate Validity Is Beneficial

Despite the added operational effort, shorter certificate lifetimes solve several long standing security problems:

1. Reduced Risk from Private Key Compromise

If a private key is stolen, a shorter certificate lifespan limits how long attackers can abuse it.

2. Stronger Alignment of Ownership and Control

Frequent renewals ensure that the organisation requesting the certificate still controls the domain and infrastructure.

3. Encouragement of Automation

Short lifetimes push organisations toward automated, modern certificate management reducing human error.

4. Preparing for the Future

This change is part of a long-term trend toward even shorter lifespans, such as 90 days or even 47 days till 2029, improving overall internet security.

Conclusion

Shorter certificate validity periods present a mixed but largely positive outlook for organisations. On the positive side, they significantly reduce exposure from compromised private keys, ensure certificate inventories remain up to date, and limit the impact of misused certificates, thereby strengthening overall security. They also encourage automation and modernisation of certificate management processes and align well with Zero Trust security principles by continuously validating trust. On the other hand, shorter lifespans increase the frequency of renewals, leading to higher operational overhead, more frequent domain and organisation validations, and a greater risk of service outages if automation is not in place. Additionally, organisations may need to invest in new tools and process improvements to manage certificates effectively at scale.

The move to 199-day maximum TLS certificate validity marks a significant shift in internet security strategy. While it introduces operational challenges, it addresses deep-rooted issues related to key compromise, revocation failures, and outdated manual processes.

In the short term, organisations must adapt by improving tracking and embracing automation. In the long term, shorter certificate lifetimes create a more secure, resilient, and trustworthy internet.

References

1. https://www.globalsign.com/en/blog/navigating-the-47-day-ssl-tls-certificate-validity-era

2. https://knowledge.digicert.com/alerts/public-tls-certificates-199-day-validity

3. https://www.sectigo.com/blog/7-reasons-shorter-ssl-certificate-validity-period

4. https://www.markmonitor.com/blog/tls-ssl-certificate-lifetimes-getting-shorter/