A flaw was found in 389-ds-base. A remote, authenticated attacker could exploit a vulnerability in the Simple Authentication and Security Layer (SASL) UNBIND process. By sending a specially crafted request, the attacker can cause a connection to stall, leading to resource exhaustion and a Denial of Service (DoS) for the server.

The Rocky Linux 10.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_64785 advisory.

    * 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)

    * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-10.2.z] (JIRA:Rocky Linux-244470)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-10.2.z] (JIRA:Rocky Linux-248770)

Tenable has extracted the preceding description block directly from the CIQ 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 Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_64784 advisory.

    * 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)

    * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-9.8.z] (JIRA:Rocky Linux-244467)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-9.8.z] (JIRA:Rocky Linux-248766)

Tenable has extracted the preceding description block directly from the CIQ 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 AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1789654818 advisory.

  - A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In     sasl_io_start_packet(), the wrapped-record length read from the wire is validated only against an upper     bound. A small wire length (0, 1, or 2) produces an encrypted_buffer_count below the already-consumed     encrypted_buffer_offset, causing an unsigned subtraction underflow in sasl_io_read_packet(). PR_Recv is     then requested to read approximately 4 GiB into a 1024-byte heap buffer, resulting in a heap buffer     overflow with attacker-controlled content. After a successful SASL bind with integrity protection (SSF >     0), a remote authenticated attacker can cause a denial of service or potentially achieve remote code     execution. This flaw is distinct from CVE-2026-11774, whose fix only guards against upper-bound overflow.
    (CVE-2026-18355)

  - A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of     op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted     sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.
    (CVE-2026-18453)

  - 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)

  - A flaw was found in 389 Directory Server. The SELFDN ACI bind-rule evaluator incorrectly matches an     anonymous LDAP client's empty bind DN against an empty stored attribute value, allowing an unauthenticated     client to satisfy access control checks intended to require a matching authenticated identity. This can     allow an anonymous LDAP client to perform an operation, such as adding or modifying a directory entry,     that a SELFDN-based ACI intended to restrict to a specific authenticated user. (CVE-2026-76560)

  - A flaw was found in 389-ds-base. A remote, authenticated attacker could exploit a vulnerability in the     Simple Authentication and Security Layer (SASL) UNBIND process. By sending a specially crafted request,     the attacker can cause a connection to stall, leading to resource exhaustion and a Denial of Service (DoS)     for the server. (CVE-2026-78701)

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

The remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1821:07 advisory.

    * 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)
      * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:64785 advisory.

    * 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)
      * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)


    Bug Fix(es) and Enhancement(s):

      * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [almalinux-10.2.z]     (JIRA:AlmaLinux-244470)
      * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [almalinux-10.2.z] (JIRA:AlmaLinux-248770)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:64784 advisory.

    * 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)
      * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)


    Bug Fix(es) and Enhancement(s):

      * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [almalinux-9.8.z]     (JIRA:AlmaLinux-244467)
      * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [almalinux-9.8.z] (JIRA:AlmaLinux-248766)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:64785 advisory.

    * 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)

    * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-10.2.z] (JIRA:Rocky Linux-244470)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-10.2.z] (JIRA:Rocky Linux-248770)

Tenable has extracted the preceding description block directly from the RockyLinux 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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:64784 advisory.

    * 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)

    * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-9.8.z] (JIRA:Rocky Linux-244467)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-9.8.z] (JIRA:Rocky Linux-248766)

Tenable has extracted the preceding description block directly from the RockyLinux 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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-647850 advisory.

    - Resolves: RHEL-220500 - CVE-2026-18355 389-ds-base: heap buffer overflow       via SASL wrapped-record length lower-bound underflow in       sasl_io_start_packet() [rhel-10.2.z]
    - Resolves: RHEL-222320 - CVE-2026-18453 389-ds-base: pre-authentication       NULL pointer dereference via paged results and USE_ONE_BACKEND control in       op_shared_search [rhel-10.2.z]
    - Resolves: RHEL-232863 -  CVE-2026-18922 389-ds-base: SASL PLAIN       authentication allows privilege escalation to Directory Manager via stale       identity in Cyrus SASL auxiliary property [rhel-10.2.z]
    - Resolves: RHEL-245372 - CVE-2026-76560 389-ds-base: anonymous LDAP client       can defeat SELFDN ACI bind-rule checks via empty bind DN [rhel-10.2.z]
    - Resolves: RHEL-247859 - CVE-2026-78701 389-ds-base: CVE-2026-11610       incomplete fix may introduce a connection-stall DoS [rhel-10.2.z]

Tenable has extracted the preceding description block directly from the Oracle 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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-647840 advisory.

    - Resolves: RHEL-220502 - CVE-2026-18355 389-ds-base: heap buffer overflow via SASL wrapped-record length     lower-bound underflow in sasl_io_start_packet() [rhel-9.8.z]
    - Resolves: RHEL-222321 - CVE-2026-18453 389-ds-base: pre-authentication NULL pointer dereference via     paged results and USE_ONE_BACKEND control in op_shared_search [rhel-9.8.z]
    - Resolves: RHEL-232854 - CVE-2026-18922 389-ds-base: SASL PLAIN authentication allows privilege     escalation to Directory Manager via stale identity in Cyrus SASL auxiliary property [rhel-9.8.z]
    - Resolves: RHEL-245374 - CVE-2026-76560 389-ds-base: anonymous LDAP client can defeat SELFDN ACI bind-     rule checks via empty bind DN [rhel-9.8.z]
    - Resolves: RHEL-247865 - CVE-2026-78701 389-ds-base: CVE-2026-11610 incomplete fix may introduce a     connection-stall DoS [rhel-9.8.z]

Tenable has extracted the preceding description block directly from the Oracle 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-2026:64784 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)

    * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-9.8.z] (JIRA:RHEL-244467)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-9.8.z] (JIRA:RHEL-248766)

    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-2026:64785 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)

    * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS     (CVE-2026-78701)

    Bug Fix(es) and Enhancement(s):

    * lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-10.2.z] (JIRA:RHEL-244470)

    * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation     [rhel-10.2.z] (JIRA:RHEL-248770)

    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-ds-base. A remote, authenticated attacker could exploit a vulnerability in the     Simple Authentication and Security Layer (SASL) UNBIND process. By sending a specially crafted request,     the attacker can cause a connection to stall, leading to resource exhaustion and a Denial of Service (DoS)     for the server. (CVE-2026-78701)

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

ID	Name	Product	Family	Type	Severity
357256	Rocky Linux 10.2 [CIQ] Security Update: 389-ds-base / 389-ds-base-bdb / 389-ds-base-bdb-debuginfo / etc Multiple Vulnerabilities (crlsa-2026_64785)	Nessus	Rocky Linux Local Security Checks	Local	critical
357203	Rocky Linux 9 [CIQ] Security Update: 389-ds-base / 389-ds-base-debuginfo / 389-ds-base-debugsource / etc Multiple Vulnerabilities (crlsa-2026_64784)	Nessus	Rocky Linux Local Security Checks	Local	critical
352714	AlmaLinux 9.2 [TuxCare] Security Update: 389-ds-base / 389-ds-base-devel / 389-ds-base-libs / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1789654818)	Nessus	Alma Linux Local Security Checks	Local	critical
345655	MiracleLinux 9 : 389-ds-base-2.8.0-10.el9_8 (AXSA:2026-1821:07)	Nessus	Miracle Linux Local Security Checks	Local	critical
345624	AlmaLinux 10 : 389-ds-base (ALSA-2026:64785)	Nessus	Alma Linux Local Security Checks	Local	critical
344512	AlmaLinux 9 : 389-ds-base (ALSA-2026:64784)	Nessus	Alma Linux Local Security Checks	Local	critical
344061	RockyLinux 10 : 389-ds-base (RLSA-2026:64785)	Nessus	Rocky Linux Local Security Checks	Local	critical
344054	RockyLinux 9 : 389-ds-base (RLSA-2026:64784)	Nessus	Rocky Linux Local Security Checks	Local	critical
343909	Oracle Linux 10 : ELSA-2026-64785-0: / 389-ds-base (ELSA-2026-647850)	Nessus	Oracle Linux Local Security Checks	Local	critical
343901	Oracle Linux 9 : ELSA-2026-64784-0: / 389-ds-base (ELSA-2026-647840)	Nessus	Oracle Linux Local Security Checks	Local	critical
343813	RHEL 9 : 389-ds-base (RHSA-2026:64784)	Nessus	Red Hat Local Security Checks	Local	critical
343795	RHEL 10 : 389-ds-base (RHSA-2026:64785)	Nessus	Red Hat Local Security Checks	Local	critical
339439	Linux Distros Unpatched Vulnerability : CVE-2026-78701	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-78701

medium

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

medium