CVE-2026-22690
January 10, 2026
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
Affected Packages
pypdf (CONDA):
Affected version(s) >=3.2.0 <6.6.0Fix Suggestion:
Update to version 6.6.0https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=v1.17 <6.6.0Fix Suggestion:
Update to version 6.6.0pypdf (PYTHON):
Affected version(s) >=1.0 <6.6.0Fix Suggestion:
Update to version 6.6.0pypdf (PYTHON):
Affected version(s) >=1.0 <6.6.0Fix Suggestion:
Update to version 6.6.0Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.7
Attack Vector
NETWORK
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
Exploit Maturity
UNREPORTED
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Uncontrolled Resource Consumption
EPSS
Base Score:
0.02
