CVE-2026-14940: Red Hat 389 Directory Server

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

A heap-buffer-overflow flaw was found in 389 Directory Server (389-ds-base). When normalizing a Distinguished Name (DN) that contains a legacy-quoted value encoding a multivalued nested Relative Distinguished Name (RDN), the server can write past the end of a heap allocation while sorting RDN attribute-value pairs. An unauthenticated remote attacker can trigger this condition by sending an LDAP operation whose DN reaches the DN normalization routine, such as a search with a crafted base DN. This can corrupt heap memory and may cause denial of service.

Affected products

• Red Hat 389 Directory Server: affected versions not specified
• Red Hat Directory Server: version 11.0 only; version 12.0 only; version 13.0 only
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only

Published 2026-07-07. Last modified 2026-07-09.