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389 Directory Server CVE-2026-11774

| EUVDEUVD-2026-36293 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-06-11 redhat GHSA-6mrg-rm5v-2c3q
RCE Buffer Overflow Denial Of Service Integer Overflow Red Hat 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 Directory Server 11 Red Hat Directory Server 12 Red Hat Directory Server 13 Red Hat
7.6
CVSS 3.1 · Vendor: redhat
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Severity by source

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

Network-reachable LDAP (AV:N), deterministic overflow trigger (AC:L), requires a successful SASL bind so PR:L; RCE potential gives some C/I impact but reliable outcome is service crash, hence A:H with C:L/I:L.

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

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

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

Lifecycle Timeline

2
Analysis Generated
Jun 11, 2026 - 19:15 vuln.today
CVE Published
Jun 11, 2026 - 17:54 cve.org
HIGH 7.6

DescriptionCVE.org

An integer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), adding sizeof(uint32_t) to a crafted SASL packet length prefix of 0xFFFFFFFC causes unsigned wraparound to zero, bypassing the nsslapd-maxsasliosize limit and leading to a heap buffer overflow of up to approximately 2 megabytes of attacker-controlled data. After a successful SASL bind with integrity protection (SSF > 0), a remote attacker can cause a Denial of Service (DoS) or achieve Remote Code Execution (RCE). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, enrolled host, or service account can trigger this vulnerability over the network. This flaw is independent of CVE-2025-14905, which patched schema.c only and did not modify sasl_io.c.

AnalysisAI

Heap buffer overflow in 389 Directory Server (389-ds-base) SASL I/O layer allows authenticated remote attackers to crash the LDAP service or achieve remote code execution after a successful SASL bind with integrity protection (SSF > 0). The flaw stems from an integer overflow in sasl_io_start_packet() that bypasses the nsslapd-maxsasliosize ceiling, enabling roughly 2 MB of attacker-controlled heap corruption. No public exploit identified at time of analysis, and the impact is amplified in FreeIPA and Red Hat Identity Management deployments where any enrolled user, host, or service principal qualifies as an authenticated attacker.

Technical ContextAI

389 Directory Server is the upstream LDAP implementation behind Red Hat Directory Server and the identity backbone of FreeIPA / Red Hat Identity Management. The bug lives in the SASL framing code (sasl_io.c, function sasl_io_start_packet) that reads the 4-byte length prefix preceding each SASL-wrapped LDAP message. The implementation adds sizeof(uint32_t) (4) to the attacker-supplied length to allocate a receive buffer; a crafted prefix of 0xFFFFFFFC wraps the unsigned 32-bit addition to 0, defeating the nsslapd-maxsasliosize sanity check and causing a vastly undersized allocation that is then filled with up to ~2 MB of attacker bytes - a textbook CWE-190 integer overflow leading to a heap buffer overflow. The advisory explicitly notes this is a distinct code path from CVE-2025-14905, which only repaired schema.c and left sasl_io.c untouched. CPE data covers Red Hat Directory Server 11/12/13 and the 389-ds-base packages shipped in RHEL 6 through 10.

RemediationAI

No vendor-released patch identified at time of analysis from the supplied references; monitor https://access.redhat.com/security/cve/CVE-2026-11774 and the linked Bugzilla 2484916 for fixed package versions (389-ds-base for RHEL 8/9/10 and redhat-ds for RHDS 11/12/13) and apply them as soon as they ship, prioritizing IdM/FreeIPA replicas. Until a patch is available, the most direct compensating control is to restrict SASL bind exposure - lower nsslapd-maxsasliosize toward the smallest value compatible with your largest legitimate SASL message (note this only narrows, not eliminates, the overflow window because the overflow bypasses the check entirely) and front the LDAP/LDAPS ports (389/636/3268/3269) with host firewall rules that allow only trusted client subnets and replication peers, accepting that IdM clients still need access. Where feasible, disable SASL mechanisms that negotiate integrity or confidentiality (SSF > 0) on edge replicas, but be aware this breaks GSSAPI/Kerberos binds and will disrupt FreeIPA enrollment, kinit-based logins, and replication, so it is realistic only for read-only consumer instances. Increase monitoring of ns-slapd for unexpected crashes or restarts and audit Kerberos principal issuance to limit the population of attackers who can complete a SASL bind.

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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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CVE-2026-11774 vulnerability details – vuln.today
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