CVE-2026-119207

High

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory when strict mode loads a crafted invalid PDF dictionary. Nested parsing failures add repeated exception text to newly raised errors, allowing a small malformed dictionary to amplify into very large error messages. This issue is fixed in version 6.21.3.

SeverityHigh

CVSS5.5

Exploit probability—

ProductPy-pdf Pypdf

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-400Uncontrolled resource consumption CWE-405CWE-405

How to fix

Update

py-pdf pypdf6.21.3 or later
pypdf6.21.3 or later

Affected products

Product	Affected versions	Fixed in
py-pdf pypdf	v < 6.21.3	6.21.3
pypdfPyPI	v < 6.21.3	6.21.3

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