Inefficient Algorithmic Complexity in PyPDF - CVE-2026-102999
Published: September 17, 2026 / Updated: October 1, 2026
Vulnerability identifier: #VU150651
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-102999
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 dictionary-based API for embedded files when processing a crafted PDF. A remote attacker can craft a PDF containing a large number of embedded files to cause a denial of service.
Exploitation requires accessing embedded files through the dictionary-based API.
Affected software
PyPDF
How to mitigate CVE-2026-102999
Install security update from vendor's website.
PyPDF - update to 6.19.0