CVE-2026-15722
389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica id parsing
CVSS Score
7.5
EPSS Score
0.8%
EPSS Percentile
56th
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.
| CWE | CWE-121 |
| Vendor | red hat |
| Product | red hat directory server 11.5 e4s for rhel 8 |
| Published | Jul 31, 2026 |
| Last Updated | Oct 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Directory Server 11.5 E4S for RHEL 8
All versions affected Red Hat / Red Hat Directory Server 11.7 E4S for RHEL 8
All versions affected Red Hat / Red Hat Directory Server 11.9 for RHEL 8
All versions affected Red Hat / Red Hat Directory Server 12.2 E4S for RHEL 9
All versions affected Red Hat / Red Hat Directory Server 12.4 E4S for RHEL 9
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support
All versions affected Red Hat / Red Hat Directory Server 12
All versions affected Red Hat / Red Hat Directory Server 13
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55421 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55422 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55423 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55424 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55425 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55426 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55530 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55532 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55756 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55757 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55758 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:55794 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:56047 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:56048 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:56050 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:79217 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-15722 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2499961
Credits
Red Hat would like to thank Sebastián Alba Vives for reporting this issue.