CVE-2026-35563: Api ldap client api Apache Directory LDAP API Lacks Vulnerability

HIGH
Advisory Identifier: GHSA-85rw-g4f4-jprr
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CWE-297
Published
Advisory Summary

CVE-2026-35563 is a HIGH apache directory ldap api lacks vulnerability (CWE-297: Improper Validation of Certificate with Host Mismatch) affecting Api ldap client api libraries in the Maven ecosystem. The issue involves apache directory ldap api lacks server certificate verification for ldap hostnames. Remediation is available by upgrading affected packages to version 2.1.8.

CVE-2026-35563 at a Glance

CVE Identifier CVE-2026-35563
GHSA Identifier GHSA-85rw-g4f4-jprr
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-297: Improper Validation of Certificate with Host Mismatch
Affected Product Api ldap client api
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-35563

To remediate this vulnerability, upgrade all affected Api ldap client api dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.directory.api:api-ldap-client-api fixed: 2.1.8 
<dependency>
    <groupId>org.apache.directory.api</groupId>
    <artifactId>api-ldap-client-api</artifactId>
    <version>2.1.8</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.directory.api

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-35563, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.directory.api

Analyze the terminal output to locate any version of Api ldap client api in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.1.8), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.directory.api command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-297: Improper Validation of Certificate with Host Mismatch, where the product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host. In Api ldap client api, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-35563 Affected Api ldap client api Versions

1 component(s)
Fixed Versions:
2.1.8
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.directory.api:api-ldap-client-api
maven/org.apache.directory.api/api-ldap-client-api
Maven
≥ 2.0.0
< 2.1.8
2.1.8

References

NVD — CVE-2026-35563 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35563
Security Fix Commit FIX COMMIT
https://github.com/apache/directory-ldap-api/commit/57a7726d8b6436c74945c12f5ba4e12d232d2bac
Api ldap client api Source Repository REPOSITORY
https://github.com/apache/directory-ldap-api
lists.apache.org/thread/5rc2nzqxp1m9... WEB
https://lists.apache.org/thread/5rc2nzqxp1m9wknyf93r8dnp46fhc1nn
Api ldap client api Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/06/01/2

Frequently Asked Questions

What is CVE-2026-35563?
CVE-2026-35563 is a security vulnerability in Api ldap client api involving Apache Directory LDAP API lacks server certificate verification for LDAP hostnames under CWE-297: Improper Validation of Certificate with Host Mismatch.
Which Api ldap client api versions are affected?
Affected versions include releases prior to 2.1.8 across affected packages: org.apache.directory.api:api-ldap-client-api.
What version fixes CVE-2026-35563?
Upgrading to 2.1.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is api-ldap-client-api affected?
Yes, org.apache.directory.api:api-ldap-client-api is affected in releases prior to 2.1.8. Upgrade your dependency to 2.1.8 or later.
What CWE is associated with CVE-2026-35563?
CVE-2026-35563 is classified under CWE-297: Improper Validation of Certificate with Host Mismatch (The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.).
How can I check Maven dependencies for CVE-2026-35563?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.directory.api'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-85rw-g4f4-jprr",
  "modified" : "2026-07-07T23:46:48Z",
  "published" : "2026-06-01T09:31:11Z",
  "aliases" : [ "CVE-2026-35563" ],
  "summary" : "Apache Directory LDAP API lacks server certificate verification for LDAP hostnames",
  "details" : "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.\n\nThe root cause of this vulnerability lies in the incomplete TLS server identity verification within the LDAP client implementation.\n\nThe 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.\n\nThe hostname verification has been enforced in the new version of the LDAP API.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.directory.api:api-ldap-client-api"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.1.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-35563"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/directory-ldap-api/commit/57a7726d8b6436c74945c12f5ba4e12d232d2bac"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/directory-ldap-api"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/5rc2nzqxp1m9wknyf93r8dnp46fhc1nn"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/06/01/2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-297" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-07T23:46:48Z",
    "nvd_published_at" : "2026-06-01T08:16:20Z"
  }
}