CVE-2026-18453highCWE-476

CVE-2026-18453: high-severity vulnerability in Red Hat Directory Server 11.5 E4S for RHEL 8

389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search

Published · Updated

Follow this CVE+ Monitor Red Hat Enterprise Linux+ Monitor Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 0.8%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Red Hat · Red Hat Directory Server 11.5 E4S for RHEL 8Red Hat · Red Hat Directory Server 11.7 E4S for RHEL 8Red Hat · Red Hat Directory Server 11.9 for RHEL 8Red Hat · Red Hat Directory Server 12Red Hat · Red Hat Directory Server 12.2 E4S for RHEL 9Red Hat · Red Hat Directory Server 12.4 E4S for RHEL 9Red Hat · Red Hat Directory Server 13Red Hat · Red Hat Directory Server 13.2Red Hat · Red Hat Enterprise Linux 10Red Hat · Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat · Red Hat Enterprise Linux 6Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat · Red Hat Enterprise Linux 8Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat · Red Hat Enterprise Linux 9.6 Extended Update Support
Related CVEs — Red Hat Directory Server 11.5 E4S for RHEL 8

In the same product, most dangerous first.

CVE-2025-14905HIGH389-ds-base: 389-ds-base: remote code execution and denial of service via heap buffer overflowEPSS 1.3%CVE-2024-3657HIGH389-ds-base: potential denial of service via specially crafted kerberos as-req requestEPSS 1.3%CVE-2026-18355HIGH389-ds-base: 389-ds-base: heap buffer overflow via sasl wrapped-record length lower-bound underflow in sasl_io_start_packet()EPSS 0.8%CVE-2026-15722HIGH389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica id parsingEPSS 0.8%CVE-2026-9064HIGH389-ds-base: 389-ds-base: unbounded ldap controls count in get_ldapmessage_controls_ext() causes cpu and heap amplification (remote dos)EPSS 0.8%CVE-2026-11774HIGH389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leading to heap buffer overflowEPSS 0.7%