jhead 3.03 is affected by: Incorrect Access Control. The impact is: Denial of service. The component is: iptc.c Line 122 show_IPTC(). The attack vector is: the victim must open a specially crafted JPEG file.
https://security.gentoo.org/glsa/202007-17
https://lists.debian.org/debian-lts-announce/2019/12/msg00037.html