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TI-2026-66036 Aliases CVE-2026-103877GHSA-v496-rffp-c5q7

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

Priority MEDIUM 49CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00469 40th percentileScored 2026-11-07
Fix Fixed Apache Directory LDAP API (Apache Software Foundation): 2.1.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Directory LDAP API2.1.0 to before 2.1.92.1.9Patch availableCNA
  • Apache Directory LDAP API VendorApache Affected 2.1.0 to before 2.1.9 Fixed in 2.1.9 Patch available CNA

Remediation

  • Fix · CNA Apache Directory LDAP API (Apache Software Foundation) Fixed in 2.1.9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Apache Directory LDAP API 2.1.9

    4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-66039 Apache Directory LDAP API: Denial of service via crafted telephone number valuesPriority LOW 39
    • TI-2026-66038 Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwordsPriority LOW 39
    • TI-2026-66037 Apache Directory LDAP API: Injection of plaintext responses during StartTLSPriority LOW 38
    Show all 4 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Fuse 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-103877
  2. 2026-10-03 Alias added: GHSA-v496-rffp-c5q7
  3. 2026-10-07 CVSS score added · CISA ADP
  4. 2026-10-07 CISA SSVC decision points changed
  5. 2026-10-07 Priority changed: LOW → MEDIUM
  6. 2026-10-12 Affected versions changed · Red Hat

References

Advisory 1

  • TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
  • TI-2024-30292 Apache OFBiz: Confused controller-view authorization logic (forced browsing) KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-26062 Apache OFBiz: Unauthenticated endpoint could allow execution of screen rendering code KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-21190 Apache OFBiz: Path traversal leading to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-18186 Apache HugeGraph-Server: Command execution in gremlin KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-25106 Deserialization of untrusted data in Apache ActiveMQ KEVCVSS 3.1CRITICAL 10.0
See all 4053 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences