RHSA-2026:55421HighCVSS 7.5

Red Hat Security Advisory: 389-ds-base security update

Published
August 17, 2026
Last Modified
August 17, 2026

🔗 CVE IDs covered (3)

CVE-2026-11770 →CVE-2026-11788 →CVE-2026-15722 →

📋 Description

CVE-2026-11770 — 389-ds-base: 389-ds-base: pre-auth LDAP filter injection in CleanAllRUV status check CVE-2026-11788 — 389-ds-base: 389-ds-base: NULL pointer dereference in deref control plugin BER parser CVE-2026-15722 — 389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica ID parsing

🎯 Affected products27

  • Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-0:2.2.4-20.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-0:2.2.4-20.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-0:2.2.4-20.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-0:2.2.4-20.el9_2.src as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-0:2.2.4-20.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-debuginfo-0:2.2.4-20.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-debuginfo-0:2.2.4-20.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-debuginfo-0:2.2.4-20.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-debuginfo-0:2.2.4-20.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-debugsource-0:2.2.4-20.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-debugsource-0:2.2.4-20.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-debugsource-0:2.2.4-20.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-debugsource-0:2.2.4-20.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-libs-0:2.2.4-20.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-libs-0:2.2.4-20.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-libs-0:2.2.4-20.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-libs-0:2.2.4-20.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-libs-debuginfo-0:2.2.4-20.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-libs-debuginfo-0:2.2.4-20.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-libs-debuginfo-0:2.2.4-20.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-libs-debuginfo-0:2.2.4-20.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-snmp-debuginfo-0:2.2.4-20.el9_2.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-snmp-debuginfo-0:2.2.4-20.el9_2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-snmp-debuginfo-0:2.2.4-20.el9_2.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • 389-ds-base-snmp-debuginfo-0:2.2.4-20.el9_2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)
  • python3-lib389-0:2.2.4-20.el9_2.noarch as a component of Red Hat Enterprise Linux AppStream E4S (v.9.2)

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Set nsslapd-allow-anonymous-access to rootdse or off. Restrict LDAP ports to trusted networks. Monitor for extop OID 2.16.840.1.113730.3.6.8. Use strong replication manager passwords. Workaround: Disable the deref plugin (most effective): dsconf <instance> plugin deref disable; systemctl restart dirsrv@<instance>. Disable anonymous access (nsslapd-allow-anonymous-access=off) to raise the bar from pre-auth to authenticated exploitation. Configure memory limits as defense-in-depth: set nsslapd-maxbersize and nsslapd-conntablesize, and deploy in a cgroup with memory limits. 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.

🔗 References (6)