CVE-2026-113792
Published:October 21, 2026
Updated:October 23, 2026
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
Affected Packages
pypdf (CONDA):
Affected version(s) >=6.0.0 <6.20.1Fix Suggestion:
Update to version 6.20.1https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=6.0.0 <6.20.1Fix Suggestion:
Update to version 6.20.1pypdf (PYTHON):
Affected version(s) >=6.0.0 <6.20.1Fix Suggestion:
Update to version 6.20.1Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Loop with Unreachable Exit Condition ('Infinite Loop')
EPSS
Base Score:
0.47