CVE-2020-13757

Python-RSA 4.0 ignores leading ‘{$content}’ bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).

Source: CVE-2020-13757