EUVD-2026-91361
GHSA-v496-rffp-c5q7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
RCE via deserialization gives C:H/I:H/A:H, but AC:H because the attacker must control/impersonate the LDAP server or achieve pre-TLS MITM; no attacker auth needed so PR:N.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
5DescriptionCVE.org
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.
AnalysisAI
Deserialization of untrusted schema data in Apache Directory LDAP API 2.1.0 through 2.1.8 lets a rogue, compromised, or pre-TLS man-in-the-middle LDAP server return a crafted schema object when a Java client calls loadSchema(), potentially executing arbitrary code inside the client process. The flaw is remotely reachable without credentials (CVSS vector PR:N) and vendor patches are available in 2.1.9, but exploitation requires the victim application to initiate a schema-loading connection to an endpoint the attacker controls or can impersonate, which is why the assessed vector raises attack complexity to High (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) even though the published base score is 9.8 under AC:L. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a Java application using Apache Directory LDAP API versions 2.1.0 through 2.1.8 to invoke loadSchema() (subschema retrieval) against an LDAP server that the attacker controls, has compromised, or can impersonate - either by operating a rogue server the client connects to or by performing a man-in-the-middle attack before TLS is established. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals conflict in an important way. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade Apache Directory LDAP API to version 2.1.9, which the vendor states fixes the issue; rebuild and redeploy any application bundling versions 2.1.0 through 2.1.8, and verify the patched artifact version in the dependency tree rather than only in the parent POM. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Java applications and services that depend on Apache Directory LDAP API versions 2.1.0 through 2.1.8, identify any that call loadSchema() against external or untrusted LDAP endpoints, and block outbound LDAP schema-loading traffic to unapproved servers at the network layer. …
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External POC / Exploit Code
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