CVE-2026-103552

High

Description

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.

SeverityHigh

CVSS7.3

Exploit probability—

ProductApache Directory LDAP API

PublishedOct 2, 2026

First seenOct 2, 2026

Weakness typeCWE-121CWE-121

How to fix

Update

Apache Software Foundation Apache Directory LDAP API1.2.9 or later

Vendor advisories

lists.apache.org/thread.html/fn3bwknn57266hx66w9vv6b4k8rfwcx7

Affected products

Product	Affected versions	Fixed in
Apache Software Foundation Apache Directory LDAP API	1.2.0 ≤ v < 1.2.9	1.2.9

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