CVE-2017-17554 (https://nvd.nist.gov/vuln/detail/CVE-2017-17554): A NULL pointer dereference (DoS) Vulnerability was found in the function aubio_source_avcodec_readframe in io/source_avcodec.c of aubio 0.4.6, which may lead to DoS when playing a crafted audio file. @Maintainers could you check if prior versions are affected too? Thank you