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Vulnerability · Published Oct 2, 2026 · Assigned by apache

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

Critical 9.8

In plain English

A critical-severity unsafe deserialization in Apache Directory LDAP API from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 59.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12apache-directory-apino fix listedDEBIAN-CVE-2026-103877
Debian:13apache-directory-apino fix listedDEBIAN-CVE-2026-103877
Debian:14apache-directory-apino fix listedDEBIAN-CVE-2026-103877
Ubuntu:22.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103877
Ubuntu:24.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103877
Ubuntu:26.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103877
Ubuntu:26.10apache-directory-apino fix listedUBUNTU-CVE-2026-103877

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache Directory LDAP API 2.1.0 – before 2.1.9

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References