CVE-2026-103552

Apache Directory LDAP API: A unbound client can send a deeply nested search filter that overflows the stack in the server's decoder

Apache Software Foundation Apache Directory LDAP API

CVSS

7.3High

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

Exploit odds (EPSS)0.34%Chance of exploitation activity in the next 30 days, higher than 26% of CVEs. Scored 23 Oct 2026FIRST EPSS

Fixed in1.2.9Fixed versionCVE List

Published2 Oct 2026Updated 2 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.

Stack Overflow vulnerability in Apache Directory LDAP API.

Before binding, a client can send a deeply nested search filter that overflows the stack in the server's decoder.

This issue affects Apache Directory LDAP API: from 1.2.0 before 1.2.9.

Users are recommended to upgrade to version 1.2.9, which fixes the issue.

Text from CVE List