Resource exhaustion in Py-Pdf Pypdf

CVE-2026-113789

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.

Vulnerability class: DoS (Denial of Service)

Published .

EPSS exploit prediction

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Affected products

Weakness classification (CWE)

References