Inefficient Algorithmic Complexity in PyPDF - CVE-2026-82398
Published: August 7, 2026 / Updated: September 1, 2026
Vulnerability identifier: #VU141285
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: CVE-2026-82398
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 read_until_whitespace when parsing a crafted PDF input that lacks whitespace for a long time. A remote attacker can supply a crafted PDF file to cause a denial of service.
Affected software
PyPDF
How to mitigate CVE-2026-82398
Install security update from vendor's website.
PyPDF - update to 6.15.0