CVE-2026-49460
Received Received - Intake
Remote Code Execution Risk in PyPDF via FlateDecode Filter

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 long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. 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-2026-49460
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
py-pdf pypdf to 6.12.2 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
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.
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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 triggers long runtimes when processed. This happens by exploiting a stream that uses the /FlateDecode filter combined with a PNG predictor.

The issue is fixed in version 6.12.2 of pypdf.

Impact Analysis

The vulnerability can cause long runtimes when processing maliciously crafted PDF files. This could lead to performance degradation or denial of service conditions in applications using vulnerable versions of pypdf.

Mitigation Strategies

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

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