CVE-2026-103885: Apache Directory LDAP API: Denial of service via crafted telephone number values

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-02 · updated 2026-10-08
Weakness: CWE-400

Description

Asymmetric Resource Consumption vulnerability in Apache Directory LDAP API. A LDAP server using the LDAP API (like Apache DS) may consume 100% of a CPU core indefinitely when processing some badly crafted Telephone Numbers. 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 products

Apache Software Foundation Apache Directory LDAP API: from 2.1.0 before 2.1.9 — fixed in 2.1.9

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Directory LDAP API 2.1.9. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-103885 or the next vulnerability affects your stack