---
id: CVE-2026-71870
title: pypdf is a free and open-source pure-python PDF library
summary: >-
  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 fo…
severity: medium
cwe:
  - CWE-400
vendor: pypdf
product: pypdf
affected:
  - pypdf < 6.15.0
patched:
  - pypdf 6.15.0
published: '2026-08-07'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:58:37.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71870'
references:
  - url: >-
      https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/pull/3944'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.15.0'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-fp3f-mc75-235c'
  - url: 'https://github.com/py-pdf/pypdf'
tags:
  - nvd
  - ghsa
  - pip
  - osv
epss: 0.00127
epssPercentile: 0.02688
aliases:
  - GHSA-fp3f-mc75-235c
  - PYSEC-2026-3655
ecosystem: pip
ingestedAt: '2026-08-07T20:16:41.557Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-71870)

Affected packages:

- `pypdf < 6.15.0`

Patched in:

- `pypdf 6.15.0`

Source: https://github.com/advisories/GHSA-fp3f-mc75-235c