CVE-2026-103000

UNKNOWN 0.0

pypdf: Possible large memory usage when retrieving alphabetical page labels

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.

CWE	CWE-400
Vendor	py-pdf
Product	pypdf
Published	Sep 30, 2026
Last Updated	Sep 30, 2026

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Affected Versions

py-pdf / pypdf

< 6.19.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-w23x-9jrw-r45c github.com: https://github.com/py-pdf/pypdf/pull/4096 github.com: https://github.com/py-pdf/pypdf/commit/0d8b5a8832cde1ba308b5c27567b879b7b7eed4a github.com: https://github.com/py-pdf/pypdf/releases/tag/6.19.0