The pyasn1 library used in Ansible is vulnerable to a Denial of Service (DoS) attack due to unbounded recursion when decoding ASN.1 data with deeply nested indefinite-length SEQUENCE or SET tags. An attacker can craft a payload that causes the decoder to recursively call itself until the Python interpreter crashes with a RecursionError or the system runs out of memory, resulting in service disruption. This affects versions from 1.7.2 up to but not including 13.4.0_1. A fix is available in version 13.4.0_1.