In jose4j before 0.9.5, an attacker can cause a Denial-of-Service (DoS) condition by crafting a malicious JSON Web Encryption (JWE) token with an exceptionally high compression ratio. When this token is processed by the server, it results in significant memory allocation and processing time during decompression.

jose4j before v0.9.3 allows attackers to set a low iteration count of 1000 or less.

jose4j is vulnerable to a denial of service, caused by improper input validation. By sending a specially crafted p2c value, a remote attacker could exploit this vulnerability to cause a denial of service condition.