CVE-2026-22691
Severity CVSS v4.0:
LOW
Type:
CWE-400
Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
10/01/2026
Last modified:
10/01/2026
Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for malformed startxref. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for invalid startxref entries. When rebuilding the cross-reference table, PDF files with lots of whitespace characters become problematic. Only the non-strict reading mode is affected. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.