Dear Mbed TLS Users,

We are preparing for a transition in the maintenance of TLS and X.509 libraries (both contained in the Mbed TLS project).

The existing maintainers will continue to develop and maintain TF-PSA-Crypto, which remains an actively maintained part of the project.

The existing maintainers will cease their involvement in their development and maintenance of Mbed TLS from April 2027.

Unless new maintainers have joined the project and ramped up by that time, security incident response, security fixes, and releases will cease from April 2027.

The future maintenance arrangements for the TLS and X.509 libraries have not yet been determined. We welcome contributions from organisations and individuals interested in helping sustain Mbed TLS, whether through engineering resources, funding, or other forms of support. The existing maintainers are committed to supporting new maintainers as they ramp up and take on responsibility for the libraries.

If you or your organisation are interested in contributing to the future maintenance of Mbed TLS, please contact [email protected].

We recognise the importance of these libraries to their users and the wider ecosystem, and hope that, with community involvement, a sustainable path forward can be established.

Kind regards, The Mbed TLS Team

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