# Next.js: a critical patch arrives on August 26, 2026

> Next.js prepares a security update for branches 16.3 and 15.5. In particular, a critical vulnerability must be corrected: projects in production must be updated quickly.

Web & Cyber Security

## Next.js: a critical patch arrives on August 26, 2026

Next.js prepares a security update for branches 16.3 and 15.5. In particular, a critical vulnerability must be corrected: projects in production must be updated quickly.

![actualite-nextjs-security-August-2026.png](https://sdx-development.com/media/News/actualite-nextjs-securite-aout-2026.webp?v=1788084421)

[Web & cybersecurity](https://sdx-development.com/en/news/web-cybersecurity)Published on 20 August 2026 at 09:00

Next.js announced a security release scheduled for August 26, 2026. It will concern branches 16.3 and 15.5 and must, in particular, address a critical vulnerability.

 

## Prepare for update before publication

 

For a business application or a SaaS in production, this type of ad should not be treated as a simple dependency update. First of all, the applications involved must be inventoried, the versions deployed, and a upgrade branch must be prepared.

 

After the patches are published, the sensitive paths must be tested: authentication, rights, forms, payments, asynchronous processing and integrations. The deployment can then be carried out with a back-up procedure ready for use.

 

## Maintenance is part of the product

 

The security of a web product does not stop when it is placed online. Frameworks, dependencies and environments continue to evolve; their follow-up must be organised, documented and associated with reproducible tests.

 

[Read the official announcement Next.js](https://nextjs.org/blog) · [Discover the product approach SDX →](https://sdx-development.com/en/services)

WEB & CYBERSECURITY

## Build a reliable web foundation before an incident.

Code, dependency and sensitive-path audits turn a technical alert into a controlled action plan.

- Clear priorities and risks
- Tested fixes with a rollback plan
- Long-term maintenance

[Request a project audit](https://sdx-development.com/en/contact)[View services](https://sdx-development.com/en/services)

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