CVE-2023-46250

pypdf is a free and open-source pure-python PDF library. An attacker who
uses a vulnerability present in versions 3.7.0 through 3.16.4 can craft a
PDF which leads to an infinite loop. This infinite loop blocks the current
process and can utilize a single core of the CPU by 100%. It does not
affect memory usage. That is, for example, the case when the pypdf-user
manipulates an incoming malicious PDF e.g. by merging it with another PDF
or by adding annotations. The issue was fixed in version 3.17.0. As a
workaround, apply the patch manually by modifying
pypdf/generic/_data_structures.py.