---
id: CVE-2026-102999
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 6.19.0, a
  crafted PDF containing many embedded files can cause the dictionary-based
  attachments API in pypdf/_doc_common.py to reparse the full attachment list
  for each co…
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 < 6.19.0
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T21:17:07.343'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102999'
references:
  - url: >-
      https://github.com/py-pdf/pypdf/commit/6b10556d13609a68f9ed18bb29fdd8bba88eb2c3
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/pull/4081'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.19.0'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-v247-6f48-mgcj'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-30T21:25:07.840Z'
---

## Overview

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when an application accesses the embedded-file mapping. This issue is fixed in version 6.19.0.

## Remediation

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