---
id: CVE-2026-102995
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 6.18.1, a
  crafted PDF can place unusually large source-code or destination-string tokens
  in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode
  and re…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-400
vendor: py-pdf
product: pypdf
affected:
  - pypdf < 6.18.1
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T21:17:06.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102995'
references:
  - url: >-
      https://github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/pull/4071'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.18.1'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-30T21:25:07.838Z'
---

## Overview

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode and retain oversized values during operations such as text extraction and consume excessive memory. This is a second follow-up to earlier /ToUnicode resource-consumption fixes and is limited to the remaining token-length path. This issue is fixed in version 6.18.1.

## Remediation

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