---
id: CVE-2026-102996
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 provide a TrueType or Type1 simple font with an unusually
  large /Widths array, causing pypdf/_font.py
  Font._collect_tt_t1_character_widths to pro…
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: '2026-09-30T21:17:06.863'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102996'
references:
  - url: >-
      https://github.com/py-pdf/pypdf/commit/0fb26eb8cdd01c44b3b2c9fe8329751be2f7cfd5
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/pull/4072'
    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-g9cg-prrw-2r8q'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-30T20:48:29.732492Z'
cvssSource: cna
ingestedAt: '2026-09-30T21:25:07.839Z'
---

## Overview

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/_font.py Font._collect_tt_t1_character_widths to process entries beyond the 256 character codes meaningful for a simple font and consume excessive memory during operations such as text extraction. This issue is fixed in version 6.18.1.

## Remediation

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