Infinite loop in PyPDF - CVE-2026-113794
Published: November 9, 2026
Vulnerability identifier: #VU162816
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-113794
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated attacker to cause a denial of service by making PyPDF loop indefinitely while processing a crafted PDF file.
The vulnerability exists due to an unreachable loop exit condition in standard cross-reference table parsing when an incomplete PDF ends inside that table. An unauthenticated attacker can supply such a file for processing, preventing the affected parsing operation from completing.
Affected software
PyPDF
How to mitigate CVE-2026-113794
Install security update from vendor's website.
PyPDF - update to 6.20.0