CVE-2026-71870

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause large memory consumption when pypdf/_cmap.py function parse_bfrange parses unusually large source-code or destination-string tokens in a font /ToUnicode CMap 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-400

Affected products

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

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c
• https://github.com/py-pdf/pypdf/pull/3944
• https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa
• https://github.com/py-pdf/pypdf/releases/tag/6.15.0