CVE-2026-103885

Apache Directory LDAP API: Denial of service via crafted telephone number values

Apache Software Foundation Apache Directory LDAP API

CVSS

7.5High

ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV

Exploit odds (EPSS)0.49%Chance of exploitation activity in the next 30 days, higher than 41% of CVEs. Scored 23 Oct 2026FIRST EPSS

Fixed in2.1.9Fixed versionCVE List

Published2 Oct 2026Updated 8 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List