#VU123118 Infinite loop in PyPDF

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Main Vulnerability Database Vulnerabilities #VU123118

#VU123118 Infinite loop in PyPDF

Published: February 23, 2026


Vulnerability identifier: #VU123118
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-835
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 perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop when loading circular /Prev entries in cross-reference streams. A remote attacker can trick a victim to open a specially crafted PDF and cause denial of service conditions.


Remediation

Install updates from vendor's website.

External links