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CVE-2026-22690
Good to know:
Date: January 9, 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.
Severity Score
Related Resources (7)
Severity Score
Weakness Type (CWE)
Uncontrolled Resource Consumption
CWE-400Top Fix
Upgrade Version
Upgrade to version pypdf - 6.6.0;pypdf - 6.6.0;pypdf - 6.6.0;https://github.com/py-pdf/pypdf.git - 6.6.0
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | NONE |
| Availability (A): | LOW |