Resource exhaustion in PyPDF - CVE-2026-103000
Published: September 17, 2026 / Updated: October 1, 2026
Vulnerability identifier: #VU150649
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-2026-103000
CWE-ID: CWE-400
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 uncontrolled resource consumption in the page-label retrieval functionality when retrieving page labels from a PDF with large alphabetical labels. A remote attacker can craft a PDF with large alphabetical labels to cause a denial of service.
Affected software
PyPDF
How to mitigate CVE-2026-103000
Install security update from vendor's website.
PyPDF - update to 6.19.0