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389 Directory Server EUVDEUVD-2026-51509

| CVE-2026-15722 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-07-31 redhat GHSA-5gg4-m865-6qwr
Buffer Overflow Denial Of Service Stack 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 Red Hat Suse
7.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Pre-auth network trigger with a trivial oversized field gives AV:N/AC:L/PR:N/UI:N; stack canaries bound impact to a crash, so C:N/I:N and A:H only.

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

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

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

Lifecycle Timeline

2
Analysis Generated
Jul 31, 2026 - 09:50 vuln.today
CVE Published
Jul 31, 2026 - 09:18 cve.org
HIGH 7.5

DescriptionCVE.org

A stack buffer overflow flaw was found in 389 Directory Server (389-ds-base). The get_ruvelement_from_berval() function in repl5_ruv.c copies digit characters from a network-supplied RUV berval into a fixed 16-byte stack buffer without bounds checking. A remote unauthenticated attacker can crash the LDAP server by sending a crafted StartNSDS50ReplicationRequest extended operation containing a replica ID field with more than 16 digit characters. The overflow occurs during payload decoding, before any authorization check. Stack protectors limit impact to denial of service.

AnalysisAI

Remote unauthenticated denial of service in 389 Directory Server (389-ds-base, shipped as Red Hat Directory Server 11-13 and within RHEL 6-10) allows an attacker to crash the LDAP daemon by sending a crafted replication extended operation. The flaw is a stack buffer overflow in the RUV parsing path that triggers during payload decoding before any authorization check, so no credentials are needed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach LDAP replication port
Delivery
Send StartNSDS50ReplicationRequest with oversized replica ID
Exploit
Overflow 16-byte RUV stack buffer
Execution
Stack canary aborts ns-slapd
Impact
Directory service denial of service
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Vulnerability AssessmentAI

Exploitation Exploitation requires network reachability to the 389 Directory Server LDAP endpoint and the ability to send a StartNSDS50ReplicationRequest extended operation containing an RUV element whose replica ID field exceeds 16 digit characters; the vulnerable get_ruvelement_from_berval() copy runs during payload decoding before authorization, so no bind credentials are needed (PR:N, AV:N/AC:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, base 7.5) is internally consistent with the description: network-reachable, low complexity, no privileges or user interaction, and pure availability impact - the confidentiality and integrity scores of N correctly reflect that stack canaries reduce this to a crash, not RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can reach the directory server's LDAP port sends an anonymous StartNSDS50ReplicationRequest extended operation whose RUV element carries a replica ID field of more than 16 digit characters. The oversized copy overruns the 16-byte stack buffer in get_ruvelement_from_berval(), the stack protector detects corruption, and ns-slapd aborts - taking down authentication and directory services for all dependent applications. …
Remediation No exact vendor-released fix version is present in the supplied data, so track and apply the Red Hat errata referenced at https://access.redhat.com/security/cve/CVE-2026-15722 (and the upstream 389-ds-base fix bounding the replica ID copy) as soon as they are published for your RHEL/RHDS version. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all systems running 389-ds-base or Red Hat Directory Server 11-13 on RHEL 6-10, prioritizing production authentication services and systems with external network exposure. …

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Vendor StatusVendor

SUSE

Severity: Important
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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EUVD-2026-51509 vulnerability details – vuln.today
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