CVE-2026-103877: CWE-502 Deserialization of Untrusted Data in Apache Software Foundation Apache Directory LDAP API
Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API. A rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's loadSchema() subschema search with a schema object that contains a serialized Java class, allowing some potential RCE. This issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9. Users are recommended to upgrade to version 2.1.9, which fixes the issue.
AI Analysis
Technical Summary
This vulnerability involves unsafe deserialization in the Apache Directory LDAP API. Specifically, when a client performs a loadSchema() subschema search, a rogue or compromised LDAP server can send a schema object embedding a serialized Java class. If the client deserializes this untrusted data, it may lead to remote code execution. The affected versions are from 2.1.0 up to but excluding 2.1.9. Upgrading to version 2.1.9 mitigates the issue.
Potential Impact
An attacker controlling or intercepting LDAP server responses can exploit this vulnerability to execute arbitrary code on the client system using the Apache Directory LDAP API. This can lead to full compromise of the client application environment where the API is used.
Mitigation Recommendations
Users should upgrade Apache Directory LDAP API to version 2.1.9 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated in the available data.
CVE-2026-103877: CWE-502 Deserialization of Untrusted Data in Apache Software Foundation Apache Directory LDAP API
Description
Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API. A rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's loadSchema() subschema search with a schema object that contains a serialized Java class, allowing some potential RCE. This issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9. Users are recommended to upgrade to version 2.1.9, which fixes the issue.
Affected software
Apache Software Foundation
Apache Directory LDAP API
pkg:maven/Apache Software Foundation/org.apache.directory.api:api-ldap-schema-dataRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves unsafe deserialization in the Apache Directory LDAP API. Specifically, when a client performs a loadSchema() subschema search, a rogue or compromised LDAP server can send a schema object embedding a serialized Java class. If the client deserializes this untrusted data, it may lead to remote code execution. The affected versions are from 2.1.0 up to but excluding 2.1.9. Upgrading to version 2.1.9 mitigates the issue.
Potential Impact
An attacker controlling or intercepting LDAP server responses can exploit this vulnerability to execute arbitrary code on the client system using the Apache Directory LDAP API. This can lead to full compromise of the client application environment where the API is used.
Mitigation Recommendations
Users should upgrade Apache Directory LDAP API to version 2.1.9 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-10-01T12:43:28.815Z
- State
- PUBLISHED
Threat ID: 6abf880ca43b0b3b89a3f5ee
Added to database: 10/02/2026, 10:31:40 UTC
Last enriched: 10/02/2026, 10:46:32 UTC
Last updated: 10/03/2026, 00:45:56 UTC
Views: 14
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