An issue was discovered in Poppler 22.07.0. There is a reachable abort which leads to denial of service because the main function in pdfunite.cc lacks a stream check before saving an embedded file.
https://lists.debian.org/debian-lts-announce/2023/10/msg00022.html
https://gitlab.freedesktop.org/poppler/poppler/-/issues/1276
https://gitlab.freedesktop.org/poppler/poppler/-/commit/4631115647c1e4f0482ffe0491c2f38d2231337b