Apache Directory LDAP API lacks server certificate verification for LDAP hostnames
It was identified that the LDAP client implementation in version 2.1.7 does not verify if the server certificate matches the intended LDAP hostname. While the underlying code validates the certificate chain against a trusted authority, the absence of endpoint identification allows a valid certificate issued for an entirely unrelated host to be improperly accepted. This oversight leaves the connection highly vulnerable to server impersonation and complete connection compromise.
The root cause of this vulnerability lies in the incomplete TLS server identity verification within the LDAP client implementation.
The attacker requires MITM capability on the network to exploit this vulnerability. This attacker must be able to present a certificate trusted by the client's configured trust store.
The hostname verification has been enforced in the new version of the LDAP API.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.directory.api:api-ldap-client-api | >= 2.0.0, < 2.1.8 | 2.1.8 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-35563
- https://github.com/apache/directory-ldap-api/commit/57a7726d8b6436c74945c12f5ba4e12d232d2bac
- https://github.com/apache/directory-ldap-api
- https://lists.apache.org/thread/5rc2nzqxp1m9wknyf93r8dnp46fhc1nn
- http://www.openwall.com/lists/oss-security/2026/06/01/2
- CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:L/SA:L- Weakness (CWE)
CWE-297- Platform
- Java / Kotlin (Maven)
- Package
org.apache.directory.api:api-ldap-client-api- Disclosed
- 01.06.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-85rw-g4f4-jprr - CC BY 4.0
Vulnerability history: org.apache.directory.api:api-ldap-client-api
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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