Ubuntu Security Notice 6834-1 – It was discovered that H2 was vulnerable to deserialization of untrusted data. An attacker could possibly use this issue to execute arbitrary code. It was discovered that H2 incorrectly handled some specially crafted connection URLs. An attacker could possibly use this issue to execute arbitrary code.Ubuntu Security Notice 6834-1 – It was discovered that H2 was vulnerable to deserialization of untrusted data. An attacker could possibly use this issue to execute arbitrary code. It was discovered that H2 incorrectly handled some specially crafted connection URLs. An attacker could possibly use this issue to execute arbitrary code.