CVE-2026-113792 – pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, calling PdfWrite

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.