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

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.83% · top 42% of all CVEs (13 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

• Red Hat · Red Hat Directory Server 11.5 E4S for RHEL 8

  • unaffected 8060020260908152739.0ca98e7e – < *

• Red Hat · Red Hat Directory Server 11.7 E4S for RHEL 8

  • unaffected 8080020260806114250.f969626e – < *

• Red Hat · Red Hat Directory Server 11.9 for RHEL 8

  • unaffected 8100020260803140625.37ed7c03 – < *

• Red Hat · Red Hat Directory Server 12.2 E4S for RHEL 9

  • unaffected 9020020260730155601.1674d574 – < *

• Red Hat · Red Hat Directory Server 12.4 E4S for RHEL 9

  • unaffected 9040020260810131422.1674d574 – < *

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:3.2.0-9.el10_2 – < *

• Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support

  • unaffected 0:3.0.6-20.el10_0 – < *

• Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support

  • unaffected 0:1.3.11.1-14.el7_9 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 8100020260806150504.25e700aa – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

  • unaffected 8040020260803141511.96015a92 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

  • unaffected 8040020260803141511.96015a92 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

  • unaffected 8060020260806120442.824efc52 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

  • unaffected 8060020260806120442.824efc52 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service

  • unaffected 8080020260806114228.6dbb3803 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

  • unaffected 8080020260806114228.6dbb3803 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:2.8.0-9.el9_8 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

  • unaffected 0:2.2.4-20.el9_2 – < *

• Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

  • unaffected 0:2.4.5-27.el9_4 – < *

• Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support

  • unaffected 0:2.6.1-23.el9_6 – < *

• Red Hat · Red Hat Directory Server 12

  All versions: affected

• Red Hat · Red Hat Directory Server 13

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unknown

What to do

Workaround: Disable anonymous access by setting nsslapd-allow-anonymous-access to 'off' or 'rootdse' in cn=config. Alternatively, restrict network access to the LDAP port to trusted replication partners only using firewall rules.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-51509 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-15722](https://cveledger.app/badge/CVE-2026-15722.svg)](https://cveledger.app/cve/CVE-2026-15722)

Record last updated 4 Nov 2026, 22:01 UTC.