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CVE-2026-113794

Medium

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.20.0.

SeverityMedium
CVSS6.0
Exploit probability29. percentile0.4%
ProductPypdf
PublishedOct 21, 2026
First seenOct 21, 2026
Weakness typeCWE-835CWE-835

How to fix

Update
  • pypdf6.20.0 or later
  • py-pdf pypdf6.20.0 or later

Affected products

ProductAffected versionsFixed in
pypdfPyPIv < 6.20.06.20.0
py-pdf pypdfv < 6.20.06.20.0

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