CVE-2026-49461
Received Received - Intake
Memory Exhaustion in pypdf via Malicious PDF

Publication date: 2026-06-22

Last updated on: 2026-06-22

Assigner: GitHub, Inc.

Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting the text of a page which contains a form XObject with self-references. This vulnerability is fixed in 6.12.2.
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Meta Information
Published
2026-06-22
Last Modified
2026-06-22
Generated
2026-06-23
AI Q&A
2026-06-23
EPSS Evaluated
N/A
NVD
CVE-2026-49461
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
py-pdf pypdf 6.12.2
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
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Executive Summary

This vulnerability exists in the pypdf library, a pure-python PDF library. Before version 6.12.2, an attacker could craft a specially designed PDF file that contains a form XObject with self-references. When the text extraction process is performed on such a page, it leads to excessive memory usage.

The issue is fixed in version 6.12.2 of pypdf.

Impact Analysis

The vulnerability can cause large memory usage when processing crafted PDF files. This could potentially lead to denial of service conditions if an application using pypdf attempts to extract text from malicious PDFs, as the excessive memory consumption might degrade system performance or cause crashes.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade the pypdf library to version 6.12.2 or later, where the issue has been fixed.

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