Resource exhaustion in PyPDF - CVE-2026-27026
Published: February 20, 2026
Vulnerability identifier: #VU123112
CSH Severity: Medium
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-2026-27026
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 within /FlateDecode stream. A remote attacker can use a specially crafted PDF, trigger resource exhaustion and perform a denial of service (DoS) attack.
Affected software
PyPDF
IBM Watson Discovery for IBM Cloud Pak for Data
IBM Watson Discovery for IBM Cloud Pak for Data
How to mitigate CVE-2026-27026
Install updates from vendor's website.
PyPDF - update to 6.7.1
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2