CVE-2026-71870CWE-400denial-of-service

CVE-2026-71870

Low · published August 8, 2026

CVSS v3.1

3.3

EPSS

Percentile

2.0

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 3.3 · LOW
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
CVSS v4.0: Not supplied
EPSS: 0.00125 · 2.0th percentile
Weakness: CWE-400 · Uncontrolled Resource Consumption
Published: 2026-08-08T00:16Z

Affected products (1)

Product	Versions	Fixed in
pypdf_project/pypdf	< 6.15.0	6.15.0

References (4)

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

EPSS history

Timeline

07 AUG 19:28Z
pypdf: Possible large memory usage for large /ToUnicode streams
cvelistv5