Resource exhaustion in Py-Pdf Pypdf

CVE-2026-115572

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF that repeatedly references the same nonexistent indirect object, causing relevant file parts such as pages to trigger repeated full-file recovery loads and long runtimes when accessed. This issue is fixed in version 6.21.2.

Vulnerability class: DoS (Denial of Service)

Published .

EPSS exploit prediction

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Affected products

Weakness classification (CWE)

References