The OpenSSL DSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.1a-dev (Affected 1.1.1). Fixed in OpenSSL 1.1.0j-dev (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.0.2q-dev (Affected 1.0.2-1.0.2p). https://nvd.nist.gov/vuln/detail/CVE-2018-0734
