A flaw was found in 389 Directory Server. During SASL PLAIN authentication, a stale identity carried in a Cyrus SASL auxiliary property from a prior failed bind attempt can be installed on a connection following a subsequent, unrelated successful bind, regardless of which SASL mechanism completes that second bind. An attacker can send a SASL PLAIN bind as cn=Directory Manager with an incorrect password, then complete a SASL ANONYMOUS bind on the same connection, causing the server to grant Directory Manager authority without any valid credentials. A variant using a valid low-privileged account's own successful bind instead of an anonymous one is also possible.

redhat RHSA-2026:64793: RHSA-2026:64793: redhat-ds:11 security, bug fix, and enhancement update (Critical)

redhat RHSA-2026:64785: RHSA-2026:64785: 389-ds-base security, bug fix, and enhancement update (Critical)

redhat RHSA-2026:64790: RHSA-2026:64790: 389-ds:1.4 security, bug fix, and enhancement update (Critical)

redhat RHSA-2026:64811: RHSA-2026:64811: 389-ds-base security update (Critical)

redhat RHSA-2026:64784: RHSA-2026:64784: 389-ds-base security, bug fix, and enhancement update (Critical)

redhat RHSA-2026:64780: RHSA-2026:64780: redhat-ds:12 security, bug fix, and enhancement update (Critical)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64781 advisory.

    389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the     Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-9.4.z] (JIRA:RHEL-244465)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-9.4.z] (JIRA:RHEL-248764)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64804 advisory.

    389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the     Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-10.0.z] (JIRA:RHEL-244469)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-10.0.z] (JIRA:RHEL-248769)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64791 advisory.

    389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the     Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-8.10.z] (JIRA:RHEL-244463)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-8.10.z] (JIRA:RHEL-248762)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64783 advisory.

    389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the     Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-9.6.z] (JIRA:RHEL-244466)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-9.6.z] (JIRA:RHEL-248765)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64779 advisory.

    Red Hat Directory Server is an LDAPv3-compliant directory server. The suite of packages includes the     Lightweight Directory Access Protocol (LDAP) server, as well as command-line utilities and Web UI packages     for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds-base: Command injection via unescaped LDAP DN in Cockpit 389 Console LDAP editor     (CVE-2026-19843)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [dirsrv-12.2.z] (JIRA:DIRSRV-868)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [dirsrv-12.2.z] (JIRA:DIRSRV-900)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64778 advisory.

    389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the     Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() (JIRA:RHEL-244464)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     (JIRA:RHEL-248763)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64789 advisory.

    389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the     Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() (JIRA:RHEL-244460)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     (JIRA:RHEL-248759)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64776 advisory.

    389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the     Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() (JIRA:RHEL-244462)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     (JIRA:RHEL-248761)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64792 advisory.

    Red Hat Directory Server is an LDAPv3-compliant directory server. The suite of packages includes the     Lightweight Directory Access Protocol (LDAP) server, as well as command-line utilities and Web UI packages     for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds-base: Command injection via unescaped LDAP DN in Cockpit 389 Console LDAP editor     (CVE-2026-19843)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [dirsrv-11.7.z] (JIRA:DIRSRV-866)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [dirsrv-11.7.z] (JIRA:DIRSRV-898)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64771 advisory.

    389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the     Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

    Security Fix(es):

    * 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in     sasl_io_start_packet() (CVE-2026-18355)

    * 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and     USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

    * 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via     stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

    * 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN     (CVE-2026-76560)

    Bug Fix(es) and Enhancement(s):

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-7.9.z] (JIRA:RHEL-248758)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in 389 Directory Server. During SASL PLAIN authentication, a stale identity carried in a     Cyrus SASL auxiliary property from a prior failed bind attempt can be installed on a connection following     a subsequent, unrelated successful bind, regardless of which SASL mechanism completes that second bind. An     attacker can send a SASL PLAIN bind as cn=Directory Manager with an incorrect password, then complete a     SASL ANONYMOUS bind on the same connection, causing the server to grant Directory Manager authority     without any valid credentials. A variant using a valid low-privileged account's own successful bind     instead of an anonymous one is also possible. (CVE-2026-18922)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
343774	RHEL 9 : 389-ds-base (RHSA-2026:64781)	Nessus	Red Hat Local Security Checks	Local	critical
343773	RHEL 10 : 389-ds-base (RHSA-2026:64804)	Nessus	Red Hat Local Security Checks	Local	critical
343771	RHEL 8 : 389-ds:1.4 (RHSA-2026:64791)	Nessus	Red Hat Local Security Checks	Local	critical
343769	RHEL 9 : 389-ds-base (RHSA-2026:64783)	Nessus	Red Hat Local Security Checks	Local	critical
343768	RHEL 9 : redhat-ds:12 (RHSA-2026:64779)	Nessus	Red Hat Local Security Checks	Local	critical
343767	RHEL 9 : 389-ds-base (RHSA-2026:64778)	Nessus	Red Hat Local Security Checks	Local	critical
343763	RHEL 8 : 389-ds:1.4 (RHSA-2026:64789)	Nessus	Red Hat Local Security Checks	Local	critical
343761	RHEL 8 : 389-ds:1.4 (RHSA-2026:64776)	Nessus	Red Hat Local Security Checks	Local	critical
343753	RHEL 8 : redhat-ds:11 (RHSA-2026:64792)	Nessus	Red Hat Local Security Checks	Local	critical
343752	RHEL 7 : 389-ds-base (RHSA-2026:64771)	Nessus	Red Hat Local Security Checks	Local	critical
343496	Linux Distros Unpatched Vulnerability : CVE-2026-18922	Nessus	Misc.	Local	critical

Detections

Analytics

CVE-2026-18922

critical

Tenable Plugins

Coming Soon

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical