---
id: CVE-2026-48735
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 6.12.1, an
  attacker who uses this vulnerability can craft a PDF which leads to large
  memory usage. This requires parsing large XMP metadata, possibly with lots of
  unnecess…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: pypdf_project
product: pypdf
affected:
  - pypdf < 6.12.1
patched:
  - pypdf 6.12.1
published: '2026-05-28'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T20:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48735'
references:
  - url: 'https://github.com/py-pdf/pypdf/pull/3796'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.12.1'
    label: security-advisories@github.com
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-wjqc-6w8f-h24c'
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48735'
  - url: 'https://github.com/advisories/GHSA-wjqc-6w8f-h24c'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00128
epssPercentile: 0.02462
aliases:
  - GHSA-wjqc-6w8f-h24c
ecosystem: pip
ingestedAt: '2026-07-07T15:41:58.391Z'
---

## Overview

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.1, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing large XMP metadata, possibly with lots of unnecessary elements. This vulnerability is fixed in 6.12.1.

## Affected

- `pypdf < 6.12.1`

## Remediation

Upgrade past the affected range:

- `pypdf 6.12.1`

## Package advisory (CVE-2026-48735)

Affected packages:

- `pypdf < 6.12.1`

Patched in:

- `pypdf 6.12.1`

Source: https://github.com/advisories/GHSA-wjqc-6w8f-h24c