---
id: CVE-2026-102994
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 6.18.0, a
  crafted PDF containing indirect-object identifiers or generation-number tokens
  that continue for a long time without whitespace can cause pypdf/_reader.py
  and py…
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-407
vendor: py-pdf
product: pypdf
affected:
  - pypdf < 6.18.0
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T21:17:06.587'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102994'
references:
  - url: >-
      https://github.com/py-pdf/pypdf/commit/82501d2993c6387833c4949d205caeb188f8bb9e
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/pull/4055'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.18.0'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-5jq2-8x83-x246'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-30T20:50:09.677694Z'
cvssSource: cna
ingestedAt: '2026-09-30T20:23:19.514Z'
---

## Overview

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.0, a crafted PDF containing indirect-object identifiers or generation-number tokens that continue for a long time without whitespace can cause pypdf/_reader.py and pypdf/generic/_base.py to scan excessive input through read_until_whitespace, resulting in long runtimes and application unavailability. This issue is fixed in version 6.18.0.

## Remediation

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