---
id: CVE-2025-62708
aliases:
  - GHSA-jfx9-29x2-rv3j
  - PYSEC-2026-1831
title: pypdf can exhaust RAM via manipulated LZWDecode streams
summary: pypdf can exhaust RAM via manipulated LZWDecode streams
severity: medium
vendor: pypdf
product: pypdf
ecosystem: pip
affected:
  - pypdf < 6.1.3
patched:
  - pypdf 6.1.3
published: '2025-10-22'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:29.885611595Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-jfx9-29x2-rv3j'
references:
  - url: 'https://github.com/py-pdf/pypdf/security/advisories/GHSA-jfx9-29x2-rv3j'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-62708'
  - url: 'https://github.com/py-pdf/pypdf/pull/3502'
  - url: >-
      https://github.com/py-pdf/pypdf/commit/e51d07807ffcdaf18077b9486dadb3dc05b368da
  - url: 'https://github.com/py-pdf/pypdf'
  - url: 'https://github.com/py-pdf/pypdf/releases/tag/6.1.3'
tags:
  - osv
  - pip
epss: 0.00444
epssPercentile: 0.38048
ingestedAt: '2026-07-08T18:25:50.664Z'
---

## Overview

### Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter.

### Patches
This has been fixed in [pypdf==6.1.3](https://github.com/py-pdf/pypdf/releases/tag/6.1.3).

### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#3502](https://github.com/py-pdf/pypdf/pull/3502).

## Affected packages

- `pypdf < 6.1.3`

## Remediation

Upgrade to a patched release:

- `pypdf 6.1.3`