Infinite loop in PyPDF - CVE-2026-24688

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Main Vulnerability Database Vulnerabilities #VU125807

Infinite loop in PyPDF - CVE-2026-24688

Published: April 10, 2026


Vulnerability identifier: #VU125807
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-24688
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an infinite loop in outlines/bookmarks processing when parsing a crafted PDF and accessing outlines/bookmarks. A remote attacker can supply a specially crafted PDF to cause a denial of service.

User interaction is required to access the outlines/bookmarks in the crafted PDF.


Affected software

PyPDF
IBM Watson Discovery for IBM Cloud Pak for Data

How to mitigate CVE-2026-24688

Install security update from vendor's website.

PyPDF - update to 6.6.2
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.3.2

External References

Related Security Bulletins