Botan is a library of cryptographic algorithms written in C. It supports AES, DES, SHA-1, RSA, DSA and Diffie-Hellman. It supports multiple algorithms such as AES, DES, SHA-1, RSA, DSA and Diffie-Hellman, etc. A security vulnerability exists in Botan versions 1.11.34 and later up to 2.19.3, which stems from a certificate validation error and could be exploited by an attacker to forge OCSP responses.