CVE-2026-71852

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause long runtimes and large memory consumption when pypdf/_font.py function Font._collect_cid_character_widths expands unusually large CID font /W width ranges or excessive width entries during text extraction. This issue is fixed in 6.15.0.

Score

CVSS 4.0 4.8 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-08-07

Last modified

2026-10-24

Weaknesses

CWE-834

Affected products

• Pypdf (Py-pdf)
• Pypdf (Pypdf Project)

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-fwg2-594c-jp42
• https://github.com/py-pdf/pypdf/pull/3946
• https://github.com/py-pdf/pypdf/commit/51cb6acf9e8a35b77e90b4d87d28fe3e1416d7d7
• https://github.com/py-pdf/pypdf/releases/tag/6.15.0