Threats Tagged 'cve-2026-18453'

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.

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.

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.

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.

Red Hat Directory Server 12.2 for RHEL 9.2 has multiple critical security vulnerabilities including heap buffer overflow, pre-authentication NULL pointer dereference, privilege escalation via SASL PLAIN authentication, command injection in the Cockpit LDAP editor, and bypass of bind-rule checks by anonymous LDAP clients. These issues affect the 389-ds-base component and can lead to denial of service, privilege escalation, and unauthorized access. Red Hat has released an update addressing these vulnerabilities.

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.

Multiple critical vulnerabilities have been identified and fixed in the 389 Directory Server (389-ds-base), an LDAPv3 compliant server used for directory services. These include a heap buffer overflow via SASL wrapped-record length underflow, a pre-authentication NULL pointer dereference, privilege escalation through SASL PLAIN authentication, and bypass of SELFDN ACI bind-rule checks by anonymous LDAP clients. The issues affect Red Hat Enterprise Linux 8.4 variants and related packages. A security update addressing these vulnerabilities is available from Red Hat.

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 is a high severity vulnerability in 389 Directory Server used by Red Hat Directory Server 11.5 E4S for RHEL 8. It involves a missing NULL pointer check in the paged results handling of the op_shared_search function. An unauthenticated remote attacker can exploit this flaw by sending a crafted sequence of LDAP search requests using the USE_ONE_BACKEND control, causing the server to crash and resulting in a denial of service condition. Red Hat has issued a security advisory with a patch to fix this issue.