The vulnerability of the _get_outline() function in the pypdf/_doc_common.py library of the Python library for working with PDF files, PyPDF, allows a attacker to cause a service failure.

The vulnerability of the getoutline function in the pypdf/doccommon.py library of the Python PDF handling library PyPDF is related to asymmetric resource consumption. Exploiting this vulnerability could allow an attacker to cause a service failure...

CVE-2026-84310: Asymmetric Resource Consumption (Amplification)

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/doccommon.py getoutline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths becaus...