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.
Published: 2026-10-02
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 07 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Sat, 03 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important


Fri, 02 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
References

Fri, 02 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache directory Ldap Api
Vendors & Products Apache
Apache directory Ldap Api

Fri, 02 Oct 2026 10:15:00 +0000

Type Values Removed Values Added
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.
Title Apache Directory LDAP API: Unsafe loading of Java code from LDAP schema elements
Weaknesses CWE-502
References

Subscriptions

Apache Directory Ldap Api
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-10-07T22:07:09.152Z

Reserved: 2026-10-01T12:43:28.815Z

Link: CVE-2026-103877

cve-icon Vulnrichment

Updated: 2026-10-02T21:07:21.080Z

cve-icon NVD

Status : Deferred

Published: 2026-10-02T10:17:06.437

Modified: 2026-10-07T23:16:58.850

Link: CVE-2026-103877

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-02T10:08:42Z

Links: CVE-2026-103877 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-07T23:45:15Z

Weaknesses