Resource exhaustion in PyPDF - CVE-2025-66019
Published: March 11, 2026
Vulnerability identifier: #VU123882
CSH Severity: Low
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-2025-66019
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can craft a PDF which leads to a memory usage of up to 1 GB per stream. This requires parsing the content stream of a page using the LZWDecode filter.
Affected software
PyPDF
Fusion Content-Aware Storage
IBM Fusion HCI
IBM Watson Discovery for IBM Cloud Pak for Data
Fusion Content-Aware Storage
IBM Fusion HCI
IBM Watson Discovery for IBM Cloud Pak for Data
How to mitigate CVE-2025-66019
Install updates from vendor's website.
PyPDF - update to 6.4.0
Fusion Content-Aware Storage - update to 1.1.1
IBM Fusion HCI - update to 2.13.0
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.1
Fusion Content-Aware Storage - update to 1.1.1
IBM Fusion HCI - update to 2.13.0
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.1