CVE-2026-113789 – pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves the document’s form fields. This issue is fixed in version 6.21.0.