CVE-2026-33123

Description

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-20 | Updated 2026-03-20 | Assigner GitHub_M

Problem types

CWE-400: Uncontrolled Resource Consumption

CWE-407: Inefficient Algorithmic Complexity

Product status

References

github.com/.../pypdf/security/advisories/GHSA-qpxp-75px-xjcp

github.com/py-pdf/pypdf/pull/3686

github.com/py-pdf/pypdf/releases/tag/6.9.1

cve.org (CVE-2026-33123)

nvd.nist.gov (CVE-2026-33123)

Download JSON