Excessive Iteration in PyPDF - #VU143598
Published: August 16, 2026
Vulnerability identifier: #VU143598
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-834
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to excessive iteration in XForm object extraction when extracting text from a page containing many XForm objects with reused objects. A remote attacker can craft a PDF file to cause a denial of service.
Exploitation requires the application to extract text from a page with many XForm objects, some of which are reused.
Affected software
PyPDF
Remediation
Install security update from vendor's website.
PyPDF - update to 6.16.1