CVE-2026-33123
March 20, 2026
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.
Affected Packages
pypdf (CONDA):
Affected version(s) >=3.2.0 <6.9.1Fix Suggestion:
Update to version 6.9.1https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=1.26.0 <6.9.1Fix Suggestion:
Update to version 6.9.1pypdf (PYTHON):
Affected version(s) >=1.0 <6.9.1Fix Suggestion:
Update to version 6.9.1Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.1
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
