Inefficient Algorithmic Complexity in PyPDF - #VU149044
Published: September 12, 2026
Vulnerability identifier: #VU149044
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-407
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 inefficient algorithmic complexity in the indirect object parser when parsing a crafted PDF document. A remote attacker can craft a PDF with long indirect object headers to cause a denial of service.
The indirect object headers must not be terminated by whitespace.
Affected software
PyPDF
Remediation
Install security update from vendor's website.
PyPDF - update to 6.18.0