#VU125809 Inefficient Algorithmic Complexity in PyPDF - CVE-2026-28804

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Main Vulnerability Database Vulnerabilities #VU125809

#VU125809 Inefficient Algorithmic Complexity in PyPDF - CVE-2026-28804

Published: April 10, 2026


Vulnerability identifier: #VU125809
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-28804
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
PyPDF
Software vendor:
Pypdf Project

Description

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient algorithmic complexity in the ASCIIHexDecode stream decoder when parsing a crafted PDF stream that uses the /ASCIIHexDecode filter. A remote attacker can supply a specially crafted PDF to cause a denial of service.

Exploitation requires the application to access a stream that uses the /ASCIIHexDecode filter.


Remediation

Install security update from vendor's website.

External links