Paper/Archive/CVE-2026-103877

CVE-2026-103877

Apache Software Foundation Apache Directory LDAP API — Apache Directory LDAP API: Unsafe loading of Java code from LDAP schema elements

EPSS 0.5%CVSS 9.8

critical.is priorityof 100

CVSS 9.8 (ADP)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 40.6.406 × 208.1 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

Apache Directory LDAP API2.1.0 – < 2.1.92.1.9CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorylists.apache.org/thread.html/sys8l881blqfgoc3o724jl32bmjl8pvw refopenwall.com/lists/oss-security/2026/10/02/5