---
id: CVE-2026-102993
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 6.17.0, a
  crafted PDF can provide unusually large Roman page-label values that cause
  pypdf/_page_labels.py to generate excessively large numeral strings when an
  applicatio…
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
  - CWE-770
vendor: py-pdf
product: pypdf
affected:
  - pypdf < 6.17.0
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T20:17:27.630'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102993'
references:
  - url: >-
      https://github.com/py-pdf/pypdf/commit/89db7c4fe9315ecc964bfdf05a4e8c4b94175163
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/pull/4047'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.17.0'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-qv6h-rv94-w285'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-30T20:23:19.514Z'
---

## Overview

pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of memory and potentially making the application unavailable. This issue is fixed in version 6.17.0.

## Remediation

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