Resource exhaustion in PyPDF - CVE-2026-119204
Published: November 3, 2026
Vulnerability identifier: #VU158922
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-2026-119204
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 and potentially a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the pypdf page tree parser when parsing a PDF with many shared resources. A remote attacker can supply a specially crafted PDF to trigger large memory usage and potentially disrupt the application processing the document.
Affected software
PyPDF
How to mitigate CVE-2026-119204
Install security update from vendor's website.
PyPDF - update to 6.21.4