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EUVD-2026-379820

2026-10-02T11:58:21.324416+00:00

EUVD-2026-379820

fkie_cve-2026-103000

2026-10-02T11:58:21.324445+00:00

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.

GHSA-w23x-9jrw-r45c — pypdf: Possible large memory usage when retrieving alphabetical page labels

2026-10-02T11:58:21.324475+00:00

Affected: PyPI: pypdf

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires accessing the page labels of a document with large alphabetical labels.

### Patches

This has been fixed in [pypdf==6.19.0](https://github.com/py-pdf/pypdf/releases/tag/6.19.0).

### Workarounds

If you cannot upgrade yet, consider applying the changes from PR [#4096](https://github.com/py-pdf/pypdf/pull/4096).

PYSEC-2026-4160 — pypdf: Possible large memory usage when retrieving alphabetical page labels