Skip to main content

389 Directory Server CVE-2026-11789

| EUVDEUVD-2026-35421 MEDIUM
Integer Underflow (CWE-191)
2026-06-09 redhat GHSA-jjqx-m459-2x33
Denial Of Service Integer Overflow 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
6.5
CVSS 3.1 · NVD
Share

Severity by source

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

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

4
CVSS changed
Jun 12, 2026 - 18:37 NVD
4.9 (MEDIUM) 6.5 (MEDIUM)
CVSS changed
Jun 12, 2026 - 18:37 NVD
4.9 (MEDIUM) 6.5 (MEDIUM)
Analysis Generated
Jun 09, 2026 - 13:52 vuln.today
CVE Published
Jun 09, 2026 - 13:02 nvd
MEDIUM 4.9

DescriptionNVD

A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow when computing salt length from a crafted password hash shorter than 16 bytes, causing a buffer over-read that crashes the LDAP server during authentication.

AnalysisAI

Denial-of-service in Red Hat's 389 Directory Server allows a highly privileged network attacker to crash the LDAP service by submitting a crafted password hash shorter than 16 bytes during authentication. The SMD5 password storage plugin performs an unsigned integer underflow (CWE-191) when computing salt length from this malformed input, producing a buffer over-read that terminates the server process. No public exploit code exists and this vulnerability has not been confirmed actively exploited (CISA KEV), but the impact is a complete loss of LDAP availability with low attack complexity once the required privilege level is achieved.

Technical ContextAI

389 Directory Server is the upstream LDAP server underlying Red Hat Directory Server (RHDS) and the directory service bundled with Red Hat Enterprise Linux. The affected code path is the SMD5 (salted MD5) password storage plugin, which processes stored password hashes during bind operations. When the stored hash value is fewer than 16 bytes, the plugin attempts to compute a salt length by subtracting from an unsigned integer, producing a wrap-around underflow (CWE-191: Integer Underflow). The resulting oversized value is then used to read beyond the allocated buffer, constituting a buffer over-read that is sufficient to crash the server process. This is an availability-only flaw - no memory disclosure or code execution path has been identified. The CVSS vector AV:N/AC:L/PR:H/UI:N confirms network reachability with low complexity but mandatory high-privilege authentication.

RemediationAI

Patch available per vendor advisory - consult https://access.redhat.com/security/cve/CVE-2026-11789 for specific RHSA advisory numbers and exact fixed package versions, as no patched version number was included in the available input data. As an interim workaround, administrators can disable the SMD5 password storage plugin in 389 Directory Server if it is not required; this prevents the vulnerable code path from being reached entirely but will break authentication for any accounts whose stored password hashes use the SMD5 scheme (those accounts will be unable to bind until their passwords are reset with a supported algorithm such as PBKDF2 or bcrypt). A second mitigating control is to restrict LDAP bind access via ACIs or network firewall rules so that only known, trusted sources can reach the directory service's LDAP port (default 389/636), reducing the likelihood of a compromised high-privilege account being leveraged from an untrusted host. Neither workaround substitutes for the vendor patch.

More in Red Hat Directory Server 11

View all
CVE-2026-11610 HIGH
8.8 Jul 07

Denial of service in Red Hat / 389 Directory Server (389-ds-base, versions since ~1.3.2/2013) allows an authenticated LD
CVE-2026-11774 HIGH
7.6 Jun 11

Heap buffer overflow in 389 Directory Server (389-ds-base) SASL I/O layer allows authenticated remote attackers to crash
CVE-2026-11770 HIGH
7.5 Jul 31

Information disclosure in 389 Directory Server (upstream of Red Hat Directory Server 11-13, shipped across RHEL 6-10) le
CVE-2026-11788 HIGH
7.5 Jun 09

Remote denial of service in 389 Directory Server (Red Hat Directory Server 11/12/13 and Red Hat Enterprise Linux 6 throu
CVE-2026-15722 HIGH
7.5 Jul 31

Remote unauthenticated denial of service in 389 Directory Server (389-ds-base, shipped as Red Hat Directory Server 11-13
CVE-2026-11884 MEDIUM
6.5 Jun 10

Heap buffer overflow in Red Hat 389 Directory Server allows an authenticated Directory Manager or a compromised replicat
CVE-2026-11611 MEDIUM
6.5 Jun 08

Denial of service in Red Hat 389 Directory Server's Content Synchronization persistent search plugin enables authenticat
CVE-2026-11786 MEDIUM
6.5 Jun 09

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
CVE-2026-16560 MEDIUM
5.3 Jul 22

Heap buffer overflow in Red Hat Directory Server (389-ds-base) exposes LDAP services to remote unauthenticated denial of

Same weakness CWE-191 – Integer Underflow

View all
CVE-2014-0497 CRITICAL POC
9.8
CVE-2015-5212 MEDIUM
6.8
CVE-2017-14496 HIGH POC
7.5
CVE-2014-8768 MEDIUM POC
5.0
CVE-2017-11757 CRITICAL POC
9.8
CVE-2024-23313 CRITICAL POC
9.8
CVE-2021-3323 CRITICAL POC
9.8
CVE-2021-21811 CRITICAL POC
9.8

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
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

Share

CVE-2026-11789 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy