Resource exhaustion in Py-Pdf Pypdf

CVE-2026-102998

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. This issue is fixed in version 6.19.0.

Vulnerability class: DoS (Denial of Service)

Published · last modified .

EPSS exploit prediction

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Affected products

Weakness classification (CWE)

References