{"id":"CVE-2026-11884","title":"389-ds-base: 389-ds-base: heap buffer overflow in schema objectclass serialization due to missing oc_superior in size calculation","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 …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","cvssSource":"cna","cwe":["CWE-122"],"vendor":"Red Hat","product":"redhat-ds:11/389-ds-base","affected":["redhat-ds:11/389-ds-base (all versions)","redhat-ds:12/389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base","389-ds-base (all versions)","389-ds-base (all versions)","389-ds-base (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T16:26:44.246925Z"},"published":"2026-06-10","updated":"2026-11-05","sourceUpdated":"2026-11-05T16:22:55.109Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-11884","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-11884"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2423624"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2484913","label":"RHBZ#2484913"}],"tags":["cve.org"],"epss":0.00349,"epssPercentile":0.28722,"ingestedAt":"2026-11-05T22:38:31.347Z","slug":"CVE-2026-11884","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `redhat-ds:11/389-ds-base (all versions)`\n- `redhat-ds:12/389-ds-base (all versions)`\n- `389-ds-base (all versions)`\n- `389-ds-base (all versions)`\n- `389-ds-base`\n- `389-ds-base (all versions)`\n- `389-ds-base (all versions)`\n- `389-ds-base (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nRestrict Directory Manager access. Audit replication agreements. Monitor cn=schema modifications for unusually long SUP values. Restrict LDAP replication traffic to trusted networks.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}