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CVE-2026-86345— 389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result

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.

发现 389-ds-base 存在一个漏洞。在协商 StartTLS 期间，服务器未清除从客户端连接已缓冲的明文数据，导致中间人攻击者可以注入一个构造的 LDAP 消息。该消息会在 TLS 升级后被处理，并且由于其 messageID 与客户端待处理操作的 messageID 发生冲突，攻击者构造的消息的响应会被替换为客户端自身操作的响应。这可能使客户端应用程序将失败的认证（bind）尝试误判为成功。

CVSS 9.0 · Critical EPSS 0.38% · P30

Affected Version Matrix 11

VendorProduct Version RangeStatus
Red Hat Red Hat Directory Server 11 any affected
any affected
Red Hat Red Hat Directory Server 12 any affected
any affected
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 unknown
Red Hat Red Hat Enterprise Linux 7 any unknown
Red Hat Red Hat Enterprise Linux 8 any affected
any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-86345

Vulnerability Information
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Vulnerability Title
389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in 389-ds-base. The server does not discard plaintext bytes already buffered from a client connection when negotiating StartTLS, allowing an on-path attacker to inject a crafted LDAP message that is processed after the TLS upgrade and whose response is delivered to the client in place of the client's own pending operation's response, due to messageID collision. This can cause a client application to treat a failed authentication (bind) attempt as successful.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通信信道对预期端点的不适当限制
Source: CVE Program / CVE List V5

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 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 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 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-2026-86345

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III. Intelligence Information for CVE-2026-86345

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Vendor Advisories for CVE-2026-86345 (2)

Same Patch Batch · Red Hat · 2026-10-01 · 18 CVEs total

CVE-2026-96658 9.9 CRITICAL Foreman: safemode bypass leading to rce
CVE-2026-96659 9.1 CRITICAL Foreman: excessive permissions for viewer role on preview
CVE-2026-12405 8.8 HIGH Rubygem-foreman_remote_execution: command injection in job invocations via effective_user
CVE-2026-12541 8.2 HIGH Foreman: command injection in foreman-rake database tasks
CVE-2026-12540 8.2 HIGH Foreman: command injection in foreman-rake errors:fetch_log via request_id parameter
CVE-2026-12544 7.7 HIGH Foreman: ssti and insecure deserialization in foreman-rake configuration
CVE-2026-86344 7.5 HIGH 389-ds-base: 389-ds-base: unauthenticated worker-thread-pool exhaustion via completed-oper
CVE-2026-12423 7.5 HIGH Foreman: unauthenticated information disclosure via provisioning token validation flaw
CVE-2026-96577 7.1 HIGH Oc-mirror__release-4.21: embedded local cache registry listens on all interfaces without a
CVE-2026-12545 6.7 MEDIUM Rubygem-hammer_cli: command injection via insecure editor invocation
CVE-2026-103884 6.5 MEDIUM Keycloak-services: keycloak-services: path traversal in x.509 crl distribution point allow
CVE-2026-56097 6.5 MEDIUM Rubygem-katello: sql injection in registry proxy via labels
CVE-2026-83589 6.1 MEDIUM Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect
CVE-2026-103754 5.9 MEDIUM Ansible-runner: ansible-runner: path traversal and symlink escape in unstream_dir() allows
CVE-2026-103641 5.5 MEDIUM Gegl: gegl04: gegl: out-of-bounds read in the radiance hdr uncompressed scanline decoder
CVE-2026-12542 5.3 MEDIUM Foreman: command injection in foreman-tail
CVE-2026-56098 4.3 MEDIUM Rubygem-katello: improper authorization logic allows resource enumeration

IV. Related Vulnerabilities

Same product: Red Hat Directory Server 11
Same vendor: Red Hat
Same weakness: CWE-923

V. Comments for CVE-2026-86345

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