CVE-2026-76560

Summary

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.

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-863: Incorrect Authorization

Workarounds

Until a fix is available, review all ACIs using userattr="…#SELFDN" bind rules and confirm the target attribute cannot be set to an empty value, or add an explicit authmethod restriction to the ACI to prevent anonymous binds from satisfying the check. Where anonymous binds are not required, disabling anonymous access to the directory removes the attack surface entirely.

ADP Enrichment

CISA ADP Vulnrichment

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

References