The vulnerabilities of the functions PageObject._extract_text() and PageObject.extract_xform_text() in the Python library for working with PDF files, PyPDF, allow a hacker to cause a service failure.

The vulnerability of the functions PageObject.extracttext and PageObject.extractxformtext in the Python library for working with PDF files, PyPDF, is related to excessive iteration. Exploiting this vulnerability can allow an attacker to cause a service failure...

CVE-2026-84311: Excessive Iteration

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/page.py PageObject.extracttext and PageObject.extractxformtext to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times,...