There is a new pull request by mobinmob against master on the void-packages repository

https://github.com/mobinmob/void-packages mbedtls
https://github.com/void-linux/void-packages/pull/35637

mbedtls: update to 2.16.12.
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-12

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A patch file from https://github.com/void-linux/void-packages/pull/35637.patch is attached