Resource exhaustion in PyPDF - CVE-2026-113790
Published: October 21, 2026 / Updated: October 23, 2026
Vulnerability identifier: #VU156651
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-113790
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause excessive memory consumption, potentially resulting in a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the pypdf array and dictionary parser when processing PDF files containing large numbers of elements. A remote attacker can supply a specially crafted PDF containing arrays or dictionaries with many elements to trigger excessive memory usage and potentially cause a denial of service.
Affected software
PyPDF
How to mitigate CVE-2026-113790
Install security update from vendor's website.
PyPDF - update to 6.21.0