Description
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
redhat: directory server; redhat: 389 directory server; redhat: enterprise linux
References10
- access.redhat.com/security/cve/CVE-2026-15722 Vendor Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2499961 Issue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:55421
- access.redhat.com/errata/RHSA-2026:55422
- access.redhat.com/errata/RHSA-2026:55423
- access.redhat.com/errata/RHSA-2026:55424
- access.redhat.com/errata/RHSA-2026:55425
- access.redhat.com/errata/RHSA-2026:55426
- access.redhat.com/errata/RHSA-2026:55530
- access.redhat.com/errata/RHSA-2026:55532
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 58 · as of 13 November 2026
- CWE
- CWE-121
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.