Asymmetric Resource Consumption (Amplification) in PyPDF - CVE-2026-119207
Published: November 3, 2026
Vulnerability identifier: #VU158921
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-2026-119207
CWE-ID: CWE-405
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 pypdf's strict-mode exception handling when loading an invalid PDF dictionary. A remote attacker can craft a PDF containing an invalid dictionary to trigger large memory usage and potentially exhaust available memory.
Affected software
PyPDF
How to mitigate CVE-2026-119207
Install security update from vendor's website.
PyPDF - update to 6.21.3