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Uncontrolled Resource Consumption

CVE-2026-22690

Low
2.7/10

Summary

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 that 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.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • LOW

CWE-400 - Uncontrolled resource consumption

An uncontrolled resource allocation attack (also known as resource exhaustion attack) triggers unauthorized overconsumption of the limited resources in an application, such as memory, file system storage, database connection pool entries, and CPU. This may lead to denial of service for valid users and degradation of the application's functionality as well as that of the host operating system.

References

Advisory Timeline

  • Published