There is 1 open security issue in buster.
1 issue left for the package maintainer to handle:
A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. The highest threat from this vulnerability is to confidentiality.
You can find information about how to handle this issue in the security team's documentation.