CVE-2026-103880 PUBLISHED

Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwords

Assigner: apache
Reserved: 01.10.2026 Published: 02.10.2026 Updated: 02.10.2026

Asymmetric Resource Consumption vulnerability in Apache Directory LDAP API.

Storing a password using the bcrypt algorithm with a high force like 30 in a LDAP server that supports this algorithm will cause the server CPU to  run for hours checking the credentials. A bounded cost should be enforced to avoid a server DOS.

This issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9.

Users are recommended to upgrade to version 2.1.9, which fixes the issue.

Product Status

Vendor Apache Software Foundation
Product Apache Directory LDAP API
Versions Default: unaffected
  • affected from 2.1.0 to 2.1.9 (excl.)

Credits

  • Claude Security tool
  • The Apache Software Foundation finder

References

Problem Types

  • CWE-405 Asymmetric Resource Consumption (Amplification) CWE