Excessive Iteration in PyPDF - CVE-2026-27025

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Main Vulnerability Database Vulnerabilities #VU123111

Excessive Iteration in PyPDF - CVE-2026-27025

Published: February 20, 2026


Vulnerability identifier: #VU123111
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-2026-27025
CWE-ID: CWE-834
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 insufficient validation of user-supplied input within /ToUnicode streams. A remote attacker can use a specially crafted PDF and perform a denial of service (DoS) attack.


Affected software

PyPDF
IBM Watson Discovery for IBM Cloud Pak for Data

How to mitigate CVE-2026-27025

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

External References

Related Security Bulletins