CVE-2026-103877 Apache Directory LDAP API - Insecure Deserialization

Apache Directory LDAP API >= 2.1.0 < 2.1.9 contains an insecure deserialization vulnerability caused by processing serialized Java classes in schema objects from untrusted LDAP servers, letting attackers achieve potential remote code execution, exploit requires a rogue or compromised LDAP server or pre-TLS man-in-the-middle.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.57% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Insecure Deserialization
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2 October 2026
Updated
15 October 2026
Weakness
CWE-502

Vendor fix

Upgrade to version 2.1.9.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs