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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

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. No public exploit identified at time of analysis; stack protectors constrain the outcome to a server crash rather than code execution.

Technical ContextAI

389 Directory Server is an enterprise LDAP directory used for identity and authentication services and is the directory backend for products such as Red Hat Identity Management/FreeIPA. The vulnerability lives in the multi-master replication subsystem: get_ruvelement_from_berval() in repl5_ruv.c parses a Replica Update Vector (RUV) element supplied inside a StartNSDS50ReplicationRequest extended operation. The function copies digit characters representing the replica ID from a network-supplied berval into a fixed 16-byte stack buffer without validating the input length, matching CWE-121 (Stack-based Buffer Overflow). Because RUV/berval decoding happens early in request handling, the copy executes before the server enforces bind/authorization, exposing the code path to anonymous clients that can reach the LDAP replication port.

RemediationAI

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. As a compensating control until patched, restrict network access to the LDAP replication service so that only known replica peers can send StartNSDS50ReplicationRequest operations - enforce this with host firewall rules or network ACLs on the LDAP/LDAPS ports, which is low-risk for standalone directories but will break replication if a legitimate supplier/consumer is inadvertently blocked. Where multi-master replication is not used, ensure the replication plugin/agreement is not enabled to remove the vulnerable code path. Monitor the ns-slapd process for unexpected restarts as a detection signal, and follow the Bugzilla entry (https://bugzilla.redhat.com/show_bug.cgi?id=2499961) for the confirmed patched versions.

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

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

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

CVE-2026-18922 CRITICAL
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Authentication bypass in 389 Directory Server (shipped as Red Hat Directory Server 11-13 and within RHEL 6-10) lets remo

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

CVE-2026-76578 CRITICAL
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Unauthenticated privilege escalation in FreeIPA (Red Hat Identity Management) allows a remote attacker to gain genuine a

CVE-2026-5121 HIGH
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Remote code execution in libarchive on 32-bit systems allows unauthenticated attackers to execute arbitrary code via spe

CVE-2026-28369 CRITICAL
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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: 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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CVE-2026-15722 vulnerability details – vuln.today

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