CVE-2026-103880

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

Published Oct 2, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Apache
Apache directory Ldap Api
Vendors & Products Apache
Apache directory Ldap Api
Type Values Removed Values Added
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.
Title Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwords
Weaknesses CWE-405
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Oct 5, 2026, 6:47 PM
Reserved
Oct 1, 2026, 1:05 PM
Status
Deferred
Published
Oct 2, 2026, 10:17 AM
Modified
Oct 5, 2026, 7:17 PM