BaseFortify

Publication date: 2025-10-22

Last updated on: 2025-10-27

Assigner: GitHub, Inc.

Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.1.3, 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. This has been fixed in pypdf version 6.1.3.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-10-22

Last Modified

2025-10-27

Generated

2026-07-06

AI Q&A

2025-10-23

EPSS Evaluated

2026-07-05

NVD

CVE-2025-62708

Affected Vendors & Products

Vendor	Product	Version / Range
pypdf_project	pypdf	to 6.1.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-409	The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output.

Attack-Flow Graph

Executive Summary

This vulnerability in pypdf versions prior to 6.1.3 allows an attacker to craft a specially designed PDF that causes the library to use a large amount of memory when parsing the content stream of a page using the LZWDecode filter. This can lead to excessive memory consumption during PDF processing.

Impact Analysis

The vulnerability can cause large memory usage when processing maliciously crafted PDFs, potentially leading to denial of service or degraded performance of applications using the affected pypdf versions.

Mitigation Strategies

Update pypdf to version 6.1.3 or later, as this version contains the fix for the vulnerability related to large memory usage when parsing PDFs with the LZWDecode filter.

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