CVE-2026-103877
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductApache Directory LDAP API
PublishedOct 2, 2026
First seenOct 2, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- Apache Software Foundation Apache Directory LDAP API2.1.9 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Apache Software Foundation Apache Directory LDAP API | 2.1.0 ≤ v < 2.1.9 | 2.1.9 |
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