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Vulnerability · Published Jun 10, 2026 · Assigned by redhat

CVE-2026-11884389-ds-base: 389-ds-base: heap buffer overflow in schema objectclass serialization due to missing oc_superior in size calculation

Medium 6.5

In plain English

A medium-severity heap buffer overflow in Red Hat Directory Server 11 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 71.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12389-ds-baseno fix listedDEBIAN-CVE-2026-11884
Debian:13389-ds-baseno fix listedDEBIAN-CVE-2026-11884
Ubuntu:22.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11884
Ubuntu:24.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11884
Ubuntu:25.10389-ds-baseno fix listedUBUNTU-CVE-2026-11884
Ubuntu:26.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-11884
Ubuntu:26.10389-ds-baseno fix listedUBUNTU-CVE-2026-11884

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Directory Server 11 see references
Red Hat Red Hat Directory Server 12 see references
Red Hat Red Hat Directory Server 13 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

References