CVE-2026-27024
Received Received - Intake
Infinite Loop Vulnerability in pypdf TreeObject Handling

Publication date: 2026-02-20

Last updated on: 2026-02-24

Assigner: GitHub, Inc.

Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.
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Meta Information
Published
2026-02-20
Last Modified
2026-02-24
Generated
2026-06-16
AI Q&A
2026-02-21
EPSS Evaluated
2026-06-15
NVD
CVE-2026-27024
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
pypdf_project pypdf to 6.7.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-835 The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
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Executive Summary

This vulnerability exists in the pypdf library, a pure-python PDF library. Before version 6.7.1, an attacker could craft a specially designed PDF that triggers an infinite loop when the library accesses the children of a TreeObject, such as when processing outlines.

The issue is fixed in version 6.7.1 of pypdf.

Impact Analysis

Exploiting this vulnerability can cause the pypdf library to enter an infinite loop, potentially leading to denial of service conditions in applications that use this library to process PDF files.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade the pypdf library to version 6.7.1 or later, where the issue has been fixed.

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