CVE-2026-102994
Received Received - Intake

Denial of Service in pypdf PDF Library

Publication date: 2026-09-30

Last updated on: 2026-09-30

Assigner: GitHub, Inc.

Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.0, a crafted PDF containing indirect-object identifiers or generation-number tokens that continue for a long time without whitespace can cause pypdf/_reader.py and pypdf/generic/_base.py to scan excessive input through read_until_whitespace, resulting in long runtimes and application unavailability. This issue is fixed in version 6.18.0.

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Meta Information

Published
2026-09-30
Last Modified
2026-09-30
Generated
2026-10-01
AI Q&A
2026-09-30
EPSS Evaluated
N/A
NVD
CVE-2026-102994
EUVD
EUVD-2026-90366

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
py-pdf pypdf to 6.18.0 (exc)

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.
CWE-407 An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

Attack-Flow Graph

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Executive Summary

This vulnerability affects the pypdf library before version 6.18.0. A specially crafted PDF file containing long sequences of indirect-object identifiers or generation-number tokens without whitespace can cause the library to scan excessive input, leading to long processing times and application unavailability.

Detection Guidance

This vulnerability is specific to the pypdf library and involves crafted PDF files causing excessive processing time. Detection would require checking for pypdf versions prior to 6.18.0 in use and monitoring for unusually long processing times when handling PDF files.

Impact Analysis

This vulnerability can cause denial of service by making applications using pypdf unresponsive or slow when processing malicious PDF files. It may lead to system downtime or crashes if exploited.

Mitigation Strategies

Immediately update the pypdf library to version 6.18.0 or later to address the vulnerability. Review any applications using pypdf to ensure they are using the updated version.

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