In Rhonabwy through 1.1.13, HMAC signature verification uses a strcmp function that is vulnerable to side-channel attacks, because it stops the comparison when the first difference is spotted in the two signatures. (The fix uses gnutls_memcmp, which has constant-time execution.)

Rhonabwy 0.9.99 through 1.1.x before 1.1.7 doesn't check the RSA private key length before RSA-OAEP decryption. This allows attackers to cause a Denial of Service via a crafted JWE (JSON Web Encryption) token.

Rhonabwy before v1.1.5 was discovered to contain a buffer overflow via the component r_jwe_aesgcm_key_unwrap. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted JWE token.