Critical 9.8Published Oct 2, 2026

CVE-2026-103877Apache Directory LDAP API: Unsafe loading of Java code from LDAP schema elements

Updated under an hour ago (2026-10-19 10:00 UTC)

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It affects Apache Software Foundation Apache Directory LDAP API. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.57%, higher than 46% of scored CVEs.

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Every CVE for Apache Software Foundation Apache Directory LDAP API

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-502
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.57% (percentile 46)
Assigned by: apache
NVD analysis: Deferred
Record last updated: Oct 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache Directory LDAP API apache_software_foundation:apache_directory_ldap_api (from the name)	from 2.1.0 before 2.1.9	CNA record

References

https://lists.apache.org/thread.html/sys8l881blqfgoc3o724jl32bmjl8pvwvendor-advisory
http://www.openwall.com/lists/oss-security/2026/10/02/5

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.