CVE-2026-33123

Updated on 18 Mar 2026

Severity

5.1 Medium severity

Details

CVSS score
5.1
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Overview

About vulnerability

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and/or large memory usage. This requires accessing an array-based stream with lots of entries.

Patches

This has been fixed in pypdf==6.9.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3686.

Details

Affected product:
pypdf
Affected packages:
pypdf @ 5.9.0