CVE-2026-18453

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Red HatRed Hat Directory Server 11.7 E4S for RHEL 88080020260903102346.f969626e < *unaffected
Red HatRed Hat Directory Server 11.9 for RHEL 88100020260904171440.37ed7c03 < *unaffected
Red HatRed Hat Directory Server 12.2 E4S for RHEL 99020020260903155914.1674d574 < *unaffected
Red HatRed Hat Directory Server 12.4 E4S for RHEL 99040020260903102623.1674d574 < *unaffected
Red HatRed Hat Enterprise Linux 100:3.2.0-10.el10_2 < *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:3.0.6-21.el10_0 < *unaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support0:1.3.11.1-15.el7_9 < *unaffected
Red HatRed Hat Enterprise Linux 88100020260904155442.25e700aa < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support8040020260901171549.96015a92 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On8040020260901171549.96015a92 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support8060020260901145727.824efc52 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On8060020260901145727.824efc52 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service8080020260831180218.6dbb3803 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions8080020260831180218.6dbb3803 < *unaffected
Red HatRed Hat Enterprise Linux 90:2.8.0-10.el9_8 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions0:2.2.4-22.el9_2 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions0:2.4.5-29.el9_4 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:2.6.1-24.el9_6 < *unaffected
Red HatRed Hat Directory Server 13.21788851765 < *unaffected

Weaknesses

  • CWE-476: NULL Pointer Dereference

Workarounds

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References