# CVE-2026-15722: 389-ds-base: A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base)

CVE-2026-15722 is fixed in 7 products on 1 platform, first by ALSA-2026:55424, released August 17, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-15722
- Priority: High
- CVSS: 7.5 (important)
- EPSS: 0.0083
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 31, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | 389-ds-base RHEL 10 | 3.0.6-20.el10_0 | [RHSA-2026:55425](https://patchblox.com/security/data/fix/linux/rhsa-2026-55425.md) | Aug 17, 2026 |
| Linux | 389-ds-base RHEL 8 | 0:1.4.3.39-26.module+el8.10.0+24634+ded7774b | [RHSA-2026:55530](https://patchblox.com/security/data/fix/linux/rhsa-2026-55530.md) | Aug 19, 2026 |
| Linux | 389-ds-base RHEL 9 | 0:2.8.0-9.el9_8 | [RHSA-2026:55423](https://patchblox.com/security/data/fix/linux/rhsa-2026-55423.md) | Aug 19, 2026 |
| Linux | 389-ds-base almalinux 10 | 3.2.0-9.el10_2 | [ALSA-2026:55424](https://patchblox.com/security/data/fix/linux/alsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base almalinux 8 | 1.4.3.39-26.module_el8.10.0+4254+e9c4b400 | [ALSA-2026:55530](https://patchblox.com/security/data/fix/linux/alsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base almalinux 9 | 2.8.0-9.el9_8 | [ALSA-2026:55423](https://patchblox.com/security/data/fix/linux/alsa-2026-55423.md) | Aug 17, 2026 |
| Linux | 389-ds-base ol 10 | 0:3.2.0-9.el10_2 | [ELSA-2026-55424](https://patchblox.com/security/data/fix/linux/elsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base ol 8 | 0:1.4.3.39-26.module+el8.10.0+90990+5ec542c6 | [ELSA-2026-55530](https://patchblox.com/security/data/fix/linux/elsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base ol 9 | 0:2.8.0-9.el9_8 | [ELSA-2026-55423](https://patchblox.com/security/data/fix/linux/elsa-2026-55423.md) | Aug 17, 2026 |
| Linux | 389-ds-base rocky 10 | 0:3.2.0-9.el10_2 | [RLSA-2026:55424](https://patchblox.com/security/data/fix/linux/rlsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base rocky 8 | 0:1.4.3.39-26.module+el8.10.0+40279+2d6f642b | [RLSA-2026:55530](https://patchblox.com/security/data/fix/linux/rlsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base rocky 9 | 0:2.8.0-9.el9_8 | [RLSA-2026:55423](https://patchblox.com/security/data/fix/linux/rlsa-2026-55423.md) | Aug 17, 2026 |
| Linux | 389-ds-base-bdb almalinux 10 | 3.2.0-9.el10_2 | [ALSA-2026:55424](https://patchblox.com/security/data/fix/linux/alsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base-bdb ol 10 | 0:3.2.0-9.el10_2 | [ELSA-2026-55424](https://patchblox.com/security/data/fix/linux/elsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base-devel RHEL 8 | 0:1.4.3.39-26.module+el8.10.0+24634+ded7774b | [RHSA-2026:55530](https://patchblox.com/security/data/fix/linux/rhsa-2026-55530.md) | Aug 19, 2026 |
| Linux | 389-ds-base-devel RHEL 9 | 0:2.8.0-9.el9_8 | [RHSA-2026:55423](https://patchblox.com/security/data/fix/linux/rhsa-2026-55423.md) | Aug 19, 2026 |
| Linux | 389-ds-base-devel almalinux 10 | 3.2.0-9.el10_2 | [ALSA-2026:55424](https://patchblox.com/security/data/fix/linux/alsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base-devel almalinux 8 | 1.4.3.39-26.module_el8.10.0+4254+e9c4b400 | [ALSA-2026:55530](https://patchblox.com/security/data/fix/linux/alsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base-devel almalinux 9 | 2.8.0-9.el9_8 | [ALSA-2026:55423](https://patchblox.com/security/data/fix/linux/alsa-2026-55423.md) | Aug 17, 2026 |
| Linux | 389-ds-base-devel ol 10 | 0:3.2.0-9.el10_2 | [ELSA-2026-55424](https://patchblox.com/security/data/fix/linux/elsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base-devel ol 8 | 0:1.4.3.39-26.module+el8.10.0+90990+5ec542c6 | [ELSA-2026-55530](https://patchblox.com/security/data/fix/linux/elsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base-devel ol 9 | 0:2.8.0-9.el9_8 | [ELSA-2026-55423](https://patchblox.com/security/data/fix/linux/elsa-2026-55423.md) | Aug 17, 2026 |
| Linux | 389-ds-base-legacy-tools RHEL 8 | 0:1.4.3.39-26.module+el8.10.0+24634+ded7774b | [RHSA-2026:55530](https://patchblox.com/security/data/fix/linux/rhsa-2026-55530.md) | Aug 19, 2026 |
| Linux | 389-ds-base-legacy-tools almalinux 8 | 1.4.3.39-26.module_el8.10.0+4254+e9c4b400 | [ALSA-2026:55530](https://patchblox.com/security/data/fix/linux/alsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base-legacy-tools ol 8 | 0:1.4.3.39-26.module+el8.10.0+90990+5ec542c6 | [ELSA-2026-55530](https://patchblox.com/security/data/fix/linux/elsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base-libs RHEL 8 | 0:1.4.3.39-26.module+el8.10.0+24634+ded7774b | [RHSA-2026:55530](https://patchblox.com/security/data/fix/linux/rhsa-2026-55530.md) | Aug 19, 2026 |
| Linux | 389-ds-base-libs RHEL 9 | 0:2.8.0-9.el9_8 | [RHSA-2026:55423](https://patchblox.com/security/data/fix/linux/rhsa-2026-55423.md) | Aug 19, 2026 |
| Linux | 389-ds-base-libs almalinux 10 | 3.2.0-9.el10_2 | [ALSA-2026:55424](https://patchblox.com/security/data/fix/linux/alsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base-libs almalinux 8 | 1.4.3.39-26.module_el8.10.0+4254+e9c4b400 | [ALSA-2026:55530](https://patchblox.com/security/data/fix/linux/alsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base-libs almalinux 9 | 2.8.0-9.el9_8 | [ALSA-2026:55423](https://patchblox.com/security/data/fix/linux/alsa-2026-55423.md) | Aug 17, 2026 |
| Linux | 389-ds-base-libs ol 10 | 0:3.2.0-9.el10_2 | [ELSA-2026-55424](https://patchblox.com/security/data/fix/linux/elsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base-libs ol 8 | 0:1.4.3.39-26.module+el8.10.0+90990+5ec542c6 | [ELSA-2026-55530](https://patchblox.com/security/data/fix/linux/elsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base-libs ol 9 | 0:2.8.0-9.el9_8 | [ELSA-2026-55423](https://patchblox.com/security/data/fix/linux/elsa-2026-55423.md) | Aug 17, 2026 |
| Linux | 389-ds-base-snmp RHEL 8 | 0:1.4.3.39-26.module+el8.10.0+24634+ded7774b | [RHSA-2026:55530](https://patchblox.com/security/data/fix/linux/rhsa-2026-55530.md) | Aug 19, 2026 |
| Linux | 389-ds-base-snmp RHEL 9 | 0:2.8.0-9.el9_8 | [RHSA-2026:55423](https://patchblox.com/security/data/fix/linux/rhsa-2026-55423.md) | Aug 19, 2026 |
| Linux | 389-ds-base-snmp almalinux 10 | 3.2.0-9.el10_2 | [ALSA-2026:55424](https://patchblox.com/security/data/fix/linux/alsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base-snmp almalinux 8 | 1.4.3.39-26.module_el8.10.0+4254+e9c4b400 | [ALSA-2026:55530](https://patchblox.com/security/data/fix/linux/alsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base-snmp almalinux 9 | 2.8.0-9.el9_8 | [ALSA-2026:55423](https://patchblox.com/security/data/fix/linux/alsa-2026-55423.md) | Aug 17, 2026 |
| Linux | 389-ds-base-snmp ol 10 | 0:3.2.0-9.el10_2 | [ELSA-2026-55424](https://patchblox.com/security/data/fix/linux/elsa-2026-55424.md) | Aug 17, 2026 |
| Linux | 389-ds-base-snmp ol 8 | 0:1.4.3.39-26.module+el8.10.0+90990+5ec542c6 | [ELSA-2026-55530](https://patchblox.com/security/data/fix/linux/elsa-2026-55530.md) | Aug 17, 2026 |
| Linux | 389-ds-base-snmp ol 9 | 0:2.8.0-9.el9_8 | [ELSA-2026-55423](https://patchblox.com/security/data/fix/linux/elsa-2026-55423.md) | Aug 17, 2026 |
| Linux | python3-lib389 RHEL 8 | 0:1.4.3.39-26.module+el8.10.0+24634+ded7774b | [RHSA-2026:55530](https://patchblox.com/security/data/fix/linux/rhsa-2026-55530.md) | Aug 19, 2026 |
| Linux | python3-lib389 RHEL 9 | 0:2.8.0-9.el9_8 | [RHSA-2026:55423](https://patchblox.com/security/data/fix/linux/rhsa-2026-55423.md) | Aug 19, 2026 |
| Linux | python3-lib389 almalinux 10 | 3.2.0-9.el10_2 | [ALSA-2026:55424](https://patchblox.com/security/data/fix/linux/alsa-2026-55424.md) | Aug 17, 2026 |
| Linux | python3-lib389 almalinux 8 | 1.4.3.39-26.module_el8.10.0+4254+e9c4b400 | [ALSA-2026:55530](https://patchblox.com/security/data/fix/linux/alsa-2026-55530.md) | Aug 17, 2026 |
| Linux | python3-lib389 almalinux 9 | 2.8.0-9.el9_8 | [ALSA-2026:55423](https://patchblox.com/security/data/fix/linux/alsa-2026-55423.md) | Aug 17, 2026 |
| Linux | python3-lib389 ol 10 | 0:3.2.0-9.el10_2 | [ELSA-2026-55424](https://patchblox.com/security/data/fix/linux/elsa-2026-55424.md) | Aug 17, 2026 |
| Linux | python3-lib389 ol 8 | 0:1.4.3.39-26.module+el8.10.0+90990+5ec542c6 | [ELSA-2026-55530](https://patchblox.com/security/data/fix/linux/elsa-2026-55530.md) | Aug 17, 2026 |
| Linux | python3-lib389 ol 9 | 0:2.8.0-9.el9_8 | [ELSA-2026-55423](https://patchblox.com/security/data/fix/linux/elsa-2026-55423.md) | Aug 17, 2026 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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