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CVE-2026-18663— 389-ds-base: 389-ds-base: pre-authentication double-free in get_ldapmessage_controls_ext() via critical session tracking control

Quick assessment

Affected
Red Hat Red Hat Directory Server 11
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

389 Directory Server是389 Directory Server团队开源的一款目录服务器软件。 389 Directory Server存在资源管理错误漏洞，该漏洞源于get_ldapmessage_controls_ext()函数释放解析的controls数组时未清除SLAPI_REQCONTROLS pblock槽，导致双重释放，可能允许未经身份验证的远程攻击者通过单个BIND请求触发堆损坏和拒绝服务。

CVSS 5.9 · Medium EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Directory Server 11 any unaffected
Red Hat Red Hat Directory Server 12 any unaffected
Red Hat Red Hat Directory Server 13 any affected
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
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I. Basic Information for CVE-2026-18663

Vulnerability Information
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Vulnerability Title
389-ds-base: 389-ds-base: pre-authentication double-free in get_ldapmessage_controls_ext() via critical session tracking control
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function frees the parsed controls array on the Session Tracking critical-control rejection path without clearing the SLAPI_REQCONTROLS pblock slot. Operation teardown then frees the same pointer again, causing a double-free. An unauthenticated remote attacker can trigger this with a single BIND request carrying a critical Session Tracking control, resulting in heap corruption and potential denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
389 Directory Server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
389 Directory Server是389 Directory Server团队开源的一款目录服务器软件。 389 Directory Server存在资源管理错误漏洞，该漏洞源于get_ldapmessage_controls_ext()函数释放解析的controls数组时未清除SLAPI_REQCONTROLS pblock槽，导致双重释放，可能允许未经身份验证的远程攻击者通过单个BIND请求触发堆损坏和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Directory Server 11 - cpe:/a:redhat:directory_server:11
Red Hat Red Hat Directory Server 12 - cpe:/a:redhat:directory_server:12
Red Hat Red Hat Directory Server 13 - cpe:/a:redhat:directory_server:13
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-18663

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III. Intelligence Information for CVE-2026-18663

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Vendor Advisories for CVE-2026-18663 (2)

Same Patch Batch · Red Hat · 2026-08-12 · 19 CVEs total

CVE-2026-72526 9.9 CRITICAL Multicloud-integrations: multicloud-integrations: pull-model propagation allows hub tenant
CVE-2026-72508 9.9 CRITICAL Multicloud-operators-subscription: multicloud-operators-subscription: hub and spoke servic
CVE-2026-73268 9.9 CRITICAL Cluster-curator-controller: cluster-curator-controller: spec.install.overridejob allows ar
CVE-2026-73269 9.9 CRITICAL Cluster-curator-controller: cluster-curator-controller: tenant-controllable trigger create
CVE-2026-70398 9.6 CRITICAL Multicloud-integrations: multicloud-integrations: gitopscluster.spec.argoserver.argonamesp
CVE-2026-71471 9.0 CRITICAL Acm-search-v2-rhel9: search-v2-operator: hub search cr collector.imageoverride propagated
CVE-2026-13622 8.8 HIGH Kubevirt: virt-handler-rhel9: kubevirt: virt-handler migration proxy follows symlinks allo
CVE-2026-71473 8.5 HIGH Acm-search-v2-rhel9: search-v2-operator: addonfactory.getvaluesfromaddonannotation enables
CVE-2026-73122 7.7 HIGH Multicloud-operators-channel: multicloud-operators-channel: auto-generated role grants eve
CVE-2026-66878 7.7 HIGH Multicloud-operators-subscription: multicloud-operators-subscription: fetchchannelreferenc
CVE-2026-19654 7.5 HIGH Rsyslog: a configuration-dependent issue in rsyslog's optional imptcp input module can all
CVE-2026-71469 7.5 HIGH Acm-search-v2-api-rhel9: search-v2-api: unbounded tokenreviews cache allows unauthenticate
CVE-2026-18726 6.5 MEDIUM Open-iscsi: open-iscsi: denial of service in iscsiuio router advertisement parsing
CVE-2026-18727 6.5 MEDIUM Open-iscsi: open-iscsi: integer underflow in iscsiuio dhcpv6 parsing
CVE-2026-71846 6.5 MEDIUM Insights-client: insights-client: clusterrole grants cluster-wide secrets get/list/watch b
CVE-2026-64927 6.4 MEDIUM Multicloud-operators-channel: multicloud-operators-channel: cross-namespace secret and con
CVE-2026-19130 5.8 MEDIUM Provider-credential-controller: provider-credential-controller: cross-namespace credential
CVE-2026-19548 5.5 MEDIUM Binutils: binutils: multiple use-after-free in add_archive_element via lto plugin processi

IV. Related Vulnerabilities

Same product: Red Hat Directory Server 11
Same vendor: Red Hat
Same weakness: CWE-415

V. Comments for CVE-2026-18663

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