CVE-2026-15722: Red Hat 389 Directory Server

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer without bounds checking. A remote unauthenticated attacker can crash the LDAP server by sending a crafted StartNSDS50ReplicationRequest extended operation containing a replica ID field with more than 16 digit characters. The overflow occurs during payload decoding, before any authorization check. Stack protectors limit impact to 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
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only

Published 2026-07-31. Last modified 2026-10-08.