Skip to main content

Severity by source

Vendor (redhat) PRIMARY
MEDIUM
qualitative
NVD
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
vuln.today AI
5.3 MEDIUM

Network-reachable LDAP with no auth required; impact bounded to partial availability as crash is not guaranteed per description.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorNVD

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

Lifecycle Timeline

2
Analysis Generated
Jul 07, 2026 - 15:25 vuln.today
CVE Published
Jul 07, 2026 - 13:54 nvd
MEDIUM 5.3

DescriptionNVD

A heap-buffer-overflow flaw was found in 389 Directory Server (389-ds-base). When normalizing a Distinguished Name (DN) that contains a legacy-quoted value encoding a multivalued nested Relative Distinguished Name (RDN), the server can write past the end of a heap allocation while sorting RDN attribute-value pairs. An unauthenticated remote attacker can trigger this condition by sending an LDAP operation whose DN reaches the DN normalization routine, such as a search with a crafted base DN. This can corrupt heap memory and may cause denial of service.

AnalysisAI

Heap-buffer-overflow in 389 Directory Server's DN normalization routine allows an unauthenticated remote attacker to corrupt heap memory and likely crash the LDAP service. The flaw triggers when the server processes an LDAP operation - such as a search request - whose base DN contains a legacy-quoted value encoding a multivalued nested Relative Distinguished Name (RDN), causing an out-of-bounds write during RDN attribute-value pair sorting. Per the confirmed CVSS vector (PR:N), no authentication is required; no public exploit code or CISA KEV listing has been identified at time of analysis.

Technical ContextAI

389-ds-base is the upstream codebase for Red Hat Directory Server, an enterprise LDAP service packaged across RHEL 6 through 10 and as standalone Red Hat Directory Server 11, 12, and 13 (CPE: cpe:2.3:a:red_hat:red_hat_directory_server_11/12/13). The root cause is CWE-122 (Heap-based Buffer Overflow): the DN normalization routine allocates a heap buffer for sorting RDN components, but the legacy-quoted multi-valued nested RDN encoding causes the sort logic to write past the end of that allocation. DN normalization in LDAP servers occurs very early in request processing - before authentication - making the flaw reachable by any network-accessible client. The legacy encoding path is a historical LDAP feature retained for compatibility and is not a non-default option, meaning all installations of the affected versions process this code path.

RemediationAI

Upgrade 389-ds-base to a patched version once Red Hat issues an errata - monitor https://access.redhat.com/security/cve/CVE-2026-14940 and the associated Bugzilla ticket https://bugzilla.redhat.com/show_bug.cgi?id=2497697 for fix availability; no specific patched version number was confirmed in the available intelligence at time of analysis. As a compensating control prior to patching, restrict network access to LDAP (port 389) and LDAPS (port 636) using firewall rules or security groups to permit only trusted hosts and internal networks, reducing the unauthenticated network attack surface - note this does not eliminate risk from internal or authenticated-network attackers. If anonymous LDAP search bind is not required operationally, disabling it via the 'nsslapd-allow-anonymous-access' configuration attribute prevents unauthenticated search requests from reaching DN normalization, though this may break legacy clients relying on anonymous bind. Availability of this workaround should be tested against dependent applications before deploying in production.

CVE-2026-18663 MEDIUM
5.9 Aug 12

Heap corruption via double-free in 389-ds-base's LDAP control parsing allows an unauthenticated remote attacker to crash

CVE-2026-4631 CRITICAL POC
9.8 Apr 07

Remote code execution in Cockpit's web interface allows unauthenticated attackers to execute arbitrary commands on the h

CVE-2026-4480 CRITICAL POC
9.0 May 26

Remote code execution in Samba's printing subsystem allows remote attackers to inject arbitrary shell commands via craft

CVE-2026-18922 CRITICAL
9.8 Sep 07

Authentication bypass in 389 Directory Server (shipped as Red Hat Directory Server 11-13 and within RHEL 6-10) lets remo

CVE-2026-14544 CRITICAL
9.8 Jul 03

Remote code execution and privilege escalation in HPLIP (HP Linux Imaging and Printing) affects the hpcups print filter

CVE-2026-76578 CRITICAL
9.8 Sep 07

Unauthenticated privilege escalation in FreeIPA (Red Hat Identity Management) allows a remote attacker to gain genuine a

CVE-2026-5121 HIGH
7.5 Mar 30

Remote code execution in libarchive on 32-bit systems allows unauthenticated attackers to execute arbitrary code via spe

CVE-2026-28369 CRITICAL
9.1 Mar 27

HTTP request smuggling in Undertow (the embedded web server underpinning JBoss EAP, Red Hat Data Grid, and Apache Camel

CVE-2026-28368 CRITICAL
9.1 Mar 27

HTTP request smuggling in Red Hat Undertow allows remote unauthenticated attackers to bypass front-end security controls

CVE-2026-33845 CRITICAL
9.1 Apr 30

Out-of-bounds read in the GnuTLS DTLS handshake reassembly logic lets remote unauthenticated attackers trigger an intege

CVE-2026-28367 CRITICAL
9.1 Mar 27

HTTP request smuggling in Undertow allows remote unauthenticated attackers to send `\r\r\r` as a header block terminator

CVE-2026-16526 HIGH
8.8 Jul 30

Local privilege escalation in Performance Co-Pilot (PCP) on Red Hat Enterprise Linux 6 through 10 and OpenShift Containe

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-2026-14940 vulnerability details – vuln.today

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