| Package | Affected versions | Patched versions |
|---|---|---|
| simplex chat | < 4.2 | 4.2 |
| simplexmq | < 3.4.0 | 3.4.0 |
SimpleXMQ before 3.4.0, as used in SimpleX Chat before 4.2, does not apply a key derivation function to intended data, which can interfere with forward secrecy and can have other impacts if there is a compromise of a single private key. This occurs in the X3DH key exchange for the double ratchet protocol.
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