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CVE-2026-82398 Details

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes concatenation in a one-byte loop, causing quadratic processing cost for the long non-whitespace input. This issue is fixed in version 6.15.0.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaa	[email protected]
https://github.com/py-pdf/pypdf/pull/3947	[email protected]
https://github.com/py-pdf/pypdf/releases/tag/6.15.0	[email protected]
https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9m	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-407	Inefficient Algorithmic Complexity	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 1, 2026	CVE Modified	CISA-ADP
Aug 31, 2026	New CVE Received	[email protected]