High severity · published Oct 2, 2026
CVE-2026-103880
Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwords
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AD
Apache Directory LDAP API · Apache Software Foundation
2.1.0 before 2.1.9 · source: vendor
Affected product
AD
Apache Directory LDAP API
Apache Software Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103880
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103880
vendor-advisory
https://lists.apache.org/thread.html/39q63m54v9go6xj7pqj7q18c3szn9go4
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