Infinite loop in PyPDF - #VU133910
Published: June 8, 2026
Vulnerability identifier: #VU133910
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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
Vendor: Pypdf Project
Affected software:
PyPDF
PyPDF
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an infinite loop in font retrieval for layout-mode text extraction when processing a crafted PDF during text extraction in layout mode. A remote attacker can supply a specially crafted PDF to cause a denial of service.
Exploitation requires the application to extract text in layout mode.
Remediation
Install security update from vendor's website.