Resource exhaustion in PyPDF - CVE-2026-113791
Published: October 21, 2026 / Updated: October 23, 2026
Vulnerability identifier: #VU156652
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-2026-113791
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 content stream parser when parsing PDF content streams containing many small operations. A remote attacker can supply a specially crafted PDF for parsing to trigger excessive memory usage and potentially degrade service availability.
Affected software
PyPDF
How to mitigate CVE-2026-113791
Install security update from vendor's website.
PyPDF - update to 6.21.0