High severity · published Oct 2, 2026
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
7.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% 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
1.2.0 before 1.2.9 · source: vendor
Affected product
AD
Apache Directory LDAP API
Apache Software Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103552
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103552
vendor-advisory
https://lists.apache.org/thread.html/fn3bwknn57266hx66w9vv6b4k8rfwcx7
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