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389 Directory Server CVE-2026-11787

| EUVDEUVD-2026-35419 MEDIUM
Buffer Over-read (CWE-126)
2026-06-09 redhat GHSA-wjcg-9hh3-8323
Buffer Overflow Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Directory Server 11 Red Hat Directory Server 12 Red Hat Directory Server 13 Red Hat
6.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
SUSE
5.0 MEDIUM
AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Red Hat
5.0 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

3
CVSS changed
Jun 12, 2026 - 18:52 NVD
5.0 (MEDIUM) 6.3 (MEDIUM)
Analysis Generated
Jun 09, 2026 - 13:53 vuln.today
CVE Published
Jun 09, 2026 - 13:02 nvd
MEDIUM 5.0

DescriptionNVD

A flaw was found in 389 Directory Server. The ldap_utf8prev() function reads bytes before the start of a buffer without bounds checking, causing a heap buffer over-read in string filter parsing that may influence internal filter processing behavior.

AnalysisAI

Heap buffer over-read in Red Hat Directory Server's ldap_utf8prev() function exposes LDAP deployments to potential confidentiality, integrity, and availability impact via crafted string filter input. The flaw affects authenticated, network-accessible LDAP servers running Red Hat Directory Server 11, 12, and 13 as well as the 389-ds component shipped across Red Hat Enterprise Linux 6 through 10. No public exploit identified at time of analysis and the vulnerability is not listed in CISA KEV; however, its presence in filter parsing logic - a core LDAP code path - warrants prompt patching in internet-exposed or multi-tenant directory environments.

Technical ContextAI

389 Directory Server is Red Hat's enterprise LDAP implementation, distributed both as a standalone product (Red Hat Directory Server 11/12/13) and embedded in RHEL 6-10 (cpe:2.3:a:red_hat:red_hat_enterprise_linux_*). The vulnerable function ldap_utf8prev() is responsible for backward traversal of UTF-8 encoded byte sequences - a common operation when parsing LDAP search filter strings that may contain multi-byte characters. CWE-126 (Buffer Over-Read) describes the root cause: the function reads bytes at a memory address before the logical start of the allocated heap buffer without performing bounds validation. This over-read does not write data (distinguishing it from a buffer overflow), but it does expose arbitrary heap memory contents to the parsing logic, potentially influencing filter evaluation outcomes or leaking heap layout. The flaw resides specifically in the string filter parsing subsystem, meaning it is reachable via standard LDAP Search Request operations.

RemediationAI

The primary remediation is to apply the vendor-released patch from Red Hat once available; monitor https://access.redhat.com/security/cve/CVE-2026-11787 and the associated Bugzilla entry (https://bugzilla.redhat.com/show_bug.cgi?id=2485425) for patch release and exact fixed versions, which are not confirmed in currently available intelligence. No exact fix version can be cited at this time - absence of version data should not be interpreted as patch unavailability, only as unconfirmed status. As a compensating control until patching, restrict LDAP bind access to trusted, known-good clients by enforcing IP allowlists or firewall rules at the LDAP port (typically TCP 389/636), reducing the pool of principals who can supply crafted filter strings; this directly addresses the PR:L and AV:N prerequisites. Additionally, consider enabling LDAP access logging at the verbose level to detect anomalous filter strings containing unusual UTF-8 byte sequences, which may indicate exploitation attempts. Disabling anonymous binds (if not already done) has no direct impact since PR:L already requires credentials, but reduces overall attack surface. For RHEL deployments, subscribe to Red Hat errata notifications for the 389-ds package.

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Same weakness CWE-126 – Buffer Over-read

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected
SUSE Linux Enterprise Server 16.1 Affected

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CVE-2026-11787 vulnerability details – vuln.today
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