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    CVE-2026-86345

    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.

    Published:Oct 1, 2026
    Last Modified:Oct 9, 2026
    EPS:Oct 1, 2026
    EPSS Score:0.00382
    CVSS Score:9

    Affected Products

    Vendor
    Redhat
    Product
    Directory Server
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Redhat Directory Server

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-117548 (CVSS 6.5) — A NULL pointer dereference flaw was found in 389-ds-base. This flaw occurs when a ModifyDN (rename) operation …
    CVE-2026-86344 (CVSS 7.5) — A flaw was found in 389-ds-base. An unauthenticated remote attacker can send a complete LDAP operation followe…
    CVE-2026-18922 (CVSS 9.8) — A flaw was found in 389 Directory Server. During SASL PLAIN authentication, a stale identity carried in a Cyru…
    CVE-2026-19843 (CVSS 8.4) — A flaw was found in 389-ds-base. The Cockpit 389 Console's LDAP editor constructs an ldapsearch command by emb…
    CVE-2026-76560 (CVSS 7.5) — A flaw was found in 389 Directory Server. The SELFDN ACI bind-rule evaluator incorrectly matches an anonymous …
    CVE-2026-18355 (CVSS 7.5) — A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_…
    CVE-2026-18453 (CVSS 7.5) — A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_sha…
    CVE-2026-78701 (CVSS 6.5) — A flaw was found in 389-ds-base. A remote, authenticated attacker could exploit a vulnerability in the Simple …
    CVE-2026-18663 (CVSS 5.9) — A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function frees the parsed controls array o…
    CVE-2026-19404 (CVSS 6.5) — A flaw was found in 389 Directory Server. The CleanAllRUV and Abort CleanAllRUV replication-maintenance extend…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High