CVE-2026-103880
Received Received - Intake

Asymmetric Resource Consumption in Apache Directory LDAP API

Publication date: 2026-10-02

Last updated on: 2026-10-02

Assigner: Apache Software Foundation

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.

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Meta Information

Published
2026-10-02
Last Modified
2026-10-02
Generated
2026-10-02
AI Q&A
2026-10-02
EPSS Evaluated
N/A
NVD
CVE-2026-103880
EUVD
EUVD-2026-91359

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
apache directory_ldap_api From 2.1.0 (inc) to 2.1.9 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-405 The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric."

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Executive Summary

This is an Asymmetric Resource Consumption vulnerability in the Apache Directory LDAP API. It occurs when a bcrypt password with a high cost factor (like 30) is stored on an LDAP server that supports bcrypt. The server's CPU will be forced to work for hours while verifying credentials, potentially causing a denial of service.

Impact Analysis

This vulnerability can lead to excessive CPU usage on the LDAP server, causing performance degradation or complete unavailability. It may disrupt authentication services and impact other systems relying on the LDAP server for user verification.

Mitigation Strategies

Upgrade Apache Directory LDAP API to version 2.1.9 or later to fix the asymmetric resource consumption issue in bcrypt password handling.

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