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389 Directory Server CVE-2026-11790

| EUVDEUVD-2026-35422 MEDIUM
Uncontrolled Resource Consumption (CWE-400)
2026-06-09 redhat GHSA-5cpf-527w-96rp
Denial Of Service Red Hat Directory Server 11 Red Hat Directory Server 12 Red Hat Directory Server 13 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
4.9
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
4.9 MEDIUM
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
4.9 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jun 09, 2026 - 13:52 vuln.today
CVE Published
Jun 09, 2026 - 13:09 nvd
MEDIUM 4.9

DescriptionCVE.org

A flaw was found in 389 Directory Server. The PBKDF2-SHA256 password storage plugin does not enforce an upper bound on the iteration count extracted from stored password hashes. A privileged attacker who can modify a user's password hash can cause excessive CPU consumption during authentication, resulting in denial of service.

AnalysisAI

Uncontrolled CPU consumption in Red Hat 389 Directory Server's PBKDF2-SHA256 password storage plugin allows a highly privileged attacker who has write access to stored password hashes to craft a hash embedding an arbitrarily large iteration count, causing the LDAP server to exhaust CPU resources during any subsequent authentication attempt by the targeted user. Affected products span Red Hat Directory Server 11 through 13 and the 389-ds package as shipped across Red Hat Enterprise Linux 6 through 10. No public exploit has been identified at time of analysis, and active exploitation has not been confirmed by CISA KEV.

Technical ContextAI

389 Directory Server is the upstream LDAP directory service underpinning Red Hat Directory Server and the ds-base package in RHEL. Its PBKDF2-SHA256 plugin stores password hashes in a format that encodes the key derivation iteration count inline with the hash value. PBKDF2 (RFC 8018) is deliberately compute-intensive - iteration count is the primary tuning parameter for work factor. The root cause (CWE-400: Uncontrolled Resource Consumption) is the plugin's failure to validate the iteration count extracted from a stored hash against any upper bound before executing the derivation. Because the count is read from attacker-controllable data (the stored hash entry), a forged hash with an extreme count causes the server to perform unbounded CPU work on every authentication attempt against that account. The CVSS vector AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H confirms the impact is limited to availability with no confidentiality or integrity compromise.

RemediationAI

No vendor-released patch version has been confirmed from the available reference data at time of analysis - the Red Hat security advisory at https://access.redhat.com/security/cve/CVE-2026-11790 and the associated Bugzilla entry at https://bugzilla.redhat.com/show_bug.cgi?id=2485421 should be monitored for patch releases targeting Red Hat Directory Server 11, 12, 13 and the RHEL ds-base package. As an interim compensating control, audit and restrict directory ACLs so that write access to the userPassword attribute is limited strictly to the Directory Manager account and explicitly designated administrative service accounts - removing any delegated or non-essential write grants reduces the attacker surface for hash manipulation. Additionally, implementing authentication rate-limiting or connection throttling at the LDAP listener level can reduce the blast radius of a CPU exhaustion attempt, though this does not prevent exploitation. Note that ACL tightening and rate-limiting do not remediate the underlying unbounded iteration count flaw; apply the vendor patch upon release.

More in Red Hat Directory Server 11

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Denial of service in Red Hat / 389 Directory Server (389-ds-base, versions since ~1.3.2/2013) allows an authenticated LD
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Heap buffer overflow in 389 Directory Server (389-ds-base) SASL I/O layer allows authenticated remote attackers to crash
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Information disclosure in 389 Directory Server (upstream of Red Hat Directory Server 11-13, shipped across RHEL 6-10) le
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Remote denial of service in 389 Directory Server (Red Hat Directory Server 11/12/13 and Red Hat Enterprise Linux 6 throu
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Remote unauthenticated denial of service in 389 Directory Server (389-ds-base, shipped as Red Hat Directory Server 11-13
CVE-2026-11789 MEDIUM
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Denial-of-service in Red Hat's 389 Directory Server allows a highly privileged network attacker to crash the LDAP servic
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Heap buffer overflow in Red Hat 389 Directory Server allows an authenticated Directory Manager or a compromised replicat
CVE-2026-11611 MEDIUM
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Denial of service in Red Hat 389 Directory Server's Content Synchronization persistent search plugin enables authenticat
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Out-of-bounds read in 389 Directory Server's LDIF parser exposes limited heap memory to a highly privileged local attack
CVE-2026-11787 MEDIUM
6.3 Jun 09

Heap buffer over-read in Red Hat Directory Server's ldap_utf8prev() function exposes LDAP deployments to potential confi
CVE-2026-12528 MEDIUM
5.4 Jun 17

Heap buffer overflow in 389 Directory Server's ACI parsing layer allows an authenticated LDAP user with write access to

CVE-2026-14940 MEDIUM
5.3 Jul 07

Heap-buffer-overflow in 389 Directory Server's DN normalization routine allows an unauthenticated remote attacker to cor

Same weakness CWE-400 – Uncontrolled Resource Consumption

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CVE-2026-45498 HIGH POC
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CVE-2016-8610 HIGH
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CVE-2026-28318 HIGH POC
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CVE-2025-26673 HIGH
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CVE-2015-7978 HIGH
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CVE-2025-27473 HIGH
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CVE-2025-27469 HIGH
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
7.8

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-2026-11790 vulnerability details – vuln.today
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