CVE-2026-11884

Summary

A heap buffer overflow flaw was found in 389 Directory Server. When serializing objectclass definitions, the oc_superior (SUP) field length is omitted from buffer size calculations in read_schema_dse() and schema_oc_to_string(), but the field is still written via strcat(). An attacker with Directory Manager privileges, or a compromised replication supplier, can trigger a server crash by creating objectclasses with long SUP values. This is an incomplete fix variant of CVE-2025-14905.

Affected Software

VendorProductVersion RangeStatus

Weaknesses

  • CWE-122: Heap-based Buffer Overflow

Workarounds

Restrict Directory Manager access. Audit replication agreements. Monitor cn=schema modifications for unusually long SUP values. Restrict LDAP replication traffic to trusted networks.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References