CVE-2026-103000

Description

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.

References

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