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.
https://access.redhat.com/errata/RHSA-2026:56050
https://access.redhat.com/errata/RHSA-2026:56048
https://access.redhat.com/errata/RHSA-2026:56047
https://access.redhat.com/errata/RHSA-2026:55794
https://access.redhat.com/errata/RHSA-2026:55758
https://access.redhat.com/errata/RHSA-2026:55757
https://access.redhat.com/errata/RHSA-2026:55756
https://access.redhat.com/errata/RHSA-2026:55532
https://access.redhat.com/errata/RHSA-2026:55530
https://access.redhat.com/errata/RHSA-2026:55426
https://access.redhat.com/errata/RHSA-2026:55425
https://access.redhat.com/errata/RHSA-2026:55424
https://access.redhat.com/errata/RHSA-2026:55423