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Debian 11 is rather old, although it's an LTS, it uses an EOL OpenSSL version as mentioned in several locations.

We can't support this version in Vaultwarden since there are to many differences between the two versions of OpenSSL.
There are two options:

  1. Upgrade to at least Debian 12
  2. Use the vendored_openssl feature, which will build and link the OpenSSL v3.5 version currently used by the openssl-src crate.

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@BlackDex
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Answer selected by Moritz921
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@stefan0xC
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Converted from issue

This discussion was converted from issue #6183 on August 14, 2025 10:19.