Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwords
Summary
| CVE | CVE-2026-103880 |
|---|---|
| State | PUBLISHED |
| Assigner | apache |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-02 10:17:06 UTC |
| Updated | 2026-10-02 10:17:06 UTC |
| Description | 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. |
Risk And Classification
Problem Types: CWE-405 | CWE-405 CWE-405 Asymmetric Resource Consumption (Amplification)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Apache Software Foundation | Apache Directory LDAP API | affected 2.1.0 2.1.9 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| lists.apache.org/thread.html/39q63m54v9go6xj7pqj7q18c3szn9go4 | [email protected] | lists.apache.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Claude Security (en)
CNA: The Apache Software Foundation (en)
There are currently no legacy QID mappings associated with this CVE.