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Vulnerability · Published Jul 31, 2026 · Assigned by redhat

CVE-2026-15722389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica id parsing

High 7.5

In plain English

A high-severity stack buffer overflow in Red Hat Directory Server 11.5 E4S for RHEL 8 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 42.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10389-ds-base3.2.0-9.el10_2ALSA-2026:55424
AlmaLinux:8389-ds-base1.4.3.39-26.module_el8.10.0+4254+e9c4b400ALSA-2026:55530
AlmaLinux:9389-ds-base2.8.0-9.el9_8ALSA-2026:55423
AlmaLinux:10389-ds-base-bdb3.2.0-9.el10_2ALSA-2026:55424
AlmaLinux:10389-ds-base-devel3.2.0-9.el10_2ALSA-2026:55424
AlmaLinux:8389-ds-base-devel1.4.3.39-26.module_el8.10.0+4254+e9c4b400ALSA-2026:55530
AlmaLinux:9389-ds-base-devel2.8.0-9.el9_8ALSA-2026:55423
AlmaLinux:8389-ds-base-legacy-tools1.4.3.39-26.module_el8.10.0+4254+e9c4b400ALSA-2026:55530
AlmaLinux:10389-ds-base-libs3.2.0-9.el10_2ALSA-2026:55424
AlmaLinux:8389-ds-base-libs1.4.3.39-26.module_el8.10.0+4254+e9c4b400ALSA-2026:55530
AlmaLinux:9389-ds-base-libs2.8.0-9.el9_8ALSA-2026:55423
AlmaLinux:10389-ds-base-snmp3.2.0-9.el10_2ALSA-2026:55424
AlmaLinux:8389-ds-base-snmp1.4.3.39-26.module_el8.10.0+4254+e9c4b400ALSA-2026:55530
AlmaLinux:9389-ds-base-snmp2.8.0-9.el9_8ALSA-2026:55423
AlmaLinux:10python3-lib3893.2.0-9.el10_2ALSA-2026:55424
AlmaLinux:8python3-lib3891.4.3.39-26.module_el8.10.0+4254+e9c4b400ALSA-2026:55530
AlmaLinux:9python3-lib3892.8.0-9.el9_8ALSA-2026:55423
Debian:12389-ds-baseno fix listedDEBIAN-CVE-2026-15722
Debian:13389-ds-baseno fix listedDEBIAN-CVE-2026-15722
Rocky Linux:10389-ds-base0:3.2.0-9.el10_2RLSA-2026:55424
Rocky Linux:8389-ds-base0:1.4.3.39-26.module+el8.10.0+40279+2d6f642bRLSA-2026:55530
Rocky Linux:9389-ds-base0:2.8.0-9.el9_8RLSA-2026:55423
Ubuntu:22.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-15722
Ubuntu:24.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-15722
Ubuntu:26.04:LTS389-ds-baseno fix listedUBUNTU-CVE-2026-15722
Ubuntu:26.10389-ds-baseno fix listedUBUNTU-CVE-2026-15722

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8 see references
Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8 see references
Red Hat Red Hat Directory Server 11.9 for RHEL 8 see references
Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9 see references
Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat Directory Server 12 see references
Red Hat Red Hat Directory Server 13 see references
Red Hat Red Hat Enterprise Linux 6 see references

Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References