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Vulnerability · Published Oct 2, 2026 · Assigned by apache

CVE-2026-103880Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwords

High 7.5

In plain English

A high-severity security flaw in Apache Directory LDAP API from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 62.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12apache-directory-apino fix listedDEBIAN-CVE-2026-103880
Debian:13apache-directory-apino fix listedDEBIAN-CVE-2026-103880
Debian:14apache-directory-apino fix listedDEBIAN-CVE-2026-103880
Ubuntu:22.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103880
Ubuntu:24.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103880
Ubuntu:26.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103880
Ubuntu:26.10apache-directory-apino fix listedUBUNTU-CVE-2026-103880

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache Directory LDAP API 2.1.0 – before 2.1.9

Weakness: CWE-405 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References